* Switched rockchip64 u-boot to v2021.07 * Switched OrangePi R1 Plus to include mainline's R2S device tree * Added unsingned signed comparison patch from Paolo to fix rk3328 reboots
* Cleanup u-boot configurations for rockchip64 derivatives * Bring separate BOOT_USE_* variables into BOOT_SCENARIO * Revert BOOTDIR change in rockchip64 * Bump RK3568 BL31 to v1.35