Merge tag 'u-boot-imx-20200825' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx

For 2020.10
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- mx6: SOCs user selectable
       Fix for imx6q_logic
       Some DM conversion
- mx7: introduce secondary boot device

Travis: https://travis-ci.org/github/sbabic/u-boot-imx/builds/720918010



Signed-off-by: Tom Rini <trini@konsulko.com>