Merge tag 'ti-v2020.07-rc3' of https://gitlab.denx.de/u-boot/custodians/u-boot-ti

- Enable DM_ETH on omap3_logic board
- Enable Caches in SPL for K3 platforms
- Enable backup boot mode support for J721E
- Update the DDR timings for AM654 EVM
- Add automated tests for RX-51