Fixes for 2020.07
-----------------

- mx53: mx53menlo Convert to DM_ETH, fix fail boot
- imx8mp_evk: fix boot issue
- MX6, display5: fix environment
- drop warnings (watchdog) for i.MX8mm i.mx8mp
- enable bootaux for i.MX8M

Travis: https://travis-ci.org/github/sbabic/u-boot-imx/builds/695929999
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