Merge tag 'u-boot-amlogic-20210810' of https://source.denx.de/u-boot/custodians/u-boot-amlogic

- odroid-n2: fix fdtfile suffix for n2-plus
- sei610 & meson64_android cleanups to prepare android 11 boot support
- use Android BCB mechanism for reboot reason instead of HW reboot flag
- Switch meson64_android boot flow to use abootimg for A/B, AVB and DTBO support