Merge tag 'u-boot-amlogic-20210727' of https://source.denx.de/u-boot/custodians/u-boot-amlogic

- Add SMBIOS info for Khadas VIM boards
- Fix meson-axg-mipi PHY build
- Fix VIM3 board phy-names property setup
- Return correct value for non emmc boot sources on VIM3
- add kernel compression vars