Improvements: - RK3188 USB-UART functionality - errors triggering a hard-stop in SPL on the RK3399 are reported - Rockchip RV1108 (SoC) support - MicroCrystal RV3029 (RTC) DM driver Fixes: - RK3188 early UART setup - limit SD-card frequency to 40MHz on the RK3399-Q7 - MIPI fixes - RK3399 CPUB clock initialisation