mips: vocore2: fix various issues

- fix SPL image generation
- fix incorrect console output
- increase malloc_f and malloc_r space to fix LZMA decompression errors
- increase SPI flash clock

Signed-off-by: Mauro Condarelli <mc5686@mclink.it>
[squashed to one patch, fix commit subject and description]
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
45 jobs for mips-fixes-for-2020.10 in 70 minutes and 43 seconds (queued for 36 minutes and 7 seconds)
latest
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cppcheck

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htmldocs

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  World Build
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