WIP: rockchip: add support of ROCKpro64 board
- Add environment variable
bootcount_devpartto configure the device and partition for bootcounter file - Add Apertis-related configuration.
- Add fix for stable EMMC work.
- Several patches taken from https://github.com/ayufan-rock64/linux-mainline-u-boot
WIP: SPL could not boot yet the U-Boot stored in SPI.