microblaze: Fix tab indentation in start.S

Use tab instead of spaces.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
31 jobs for master in 138 minutes and 27 seconds (queued for 314 minutes and 52 seconds)
Status Job ID Name Coverage
  Testsuites
passed #23109
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Build envtools

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passed #23108
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Build tools-only

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passed #23107
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Check for configs without MAINTAINERS entry

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passed #23110
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Run binman, buildman, dtoc and patman testsuites

00:01:07

passed #23104
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cppcheck

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passed #23105
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grep TODO/FIXME/HACK

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passed #23106
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sloccount

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  Test.Py
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evb-ast2500 test.py

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passed #23117
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integratorcp_cm926ejs test.py

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qemu-ppce500 test.py

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passed #23125
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qemu-riscv64 test.py

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passed #23126
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qemu-x86 test.py

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passed #23127
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qemu-x86_64 test.py

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passed #23118
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qemu_arm test.py

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passed #23119
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qemu_arm64 test.py

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passed #23120
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qemu_mips test.py

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passed #23122
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qemu_mips64 test.py

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passed #23123
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qemu_mips64el test.py

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passed #23121
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qemu_mipsel test.py

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passed #23111
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sandbox test.py

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passed #23114
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sandbox_flattree test.py

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passed #23112
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sandbox_spl test.py

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passed #23115
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vexpress_ca15_tc2 test.py

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passed #23116
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vexpress_ca9x4 test.py

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passed #23129
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xilinx_versal_virt test.py

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passed #23130
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xtfpga test.py

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passed #23128
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zynq_zc702 test.py

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  World Build
passed #23131
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build all 32bit ARM platforms

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passed #23132
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build all 64bit ARM platforms

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passed #23133
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build all PowerPC platforms

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passed #23134
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build all other platforms

00:11:46