rockchip: Move to standard boot

Drop the distro-boot scripts and use standard boot instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Jonas Karlman <jonas@kwiboo.se>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ab22c0e..b84c494 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1956,8 +1956,7 @@
 	imply ADC
 	imply CMD_DM
 	imply DEBUG_UART_BOARD_INIT
-	imply DISTRO_DEFAULTS if !ROCKCHIP_RK3399
-	imply BOOTSTD_DEFAULTS if !DISTRO_DEFAULTS
+	imply BOOTSTD_DEFAULTS
 	imply FAT_WRITE
 	imply SARADC_ROCKCHIP
 	imply SPL_SYSRESET