Fixes for 2021.1 ---------------- CI: https://gitlab.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/5680 - fixes for Variscite dart6ul - imx8mp : increase malloc area - fixes for bx50v3 - imx8m: HS400ES and UHS for EVK - imx8qm-rom7720: fix phy bind