Merge tag 'u-boot-imx-20201105' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx

u-boot-imx for 2021.1
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- new boards : GE (new B1x5v2), phytec phyCORE-i.MX8MM
- converted doc to reST
- fixes for verdin-imx8mm (Toradex)
- fixes for i.MX thermal driver
- mx7ulp: Align the PLL_USB frequency
- mx53: primary/secondary bmode

Travis: https://travis-ci.org/github/sbabic/u-boot-imx/builds/741465284