fastboot: rockchip: Select FASTBOOT_FLASH[_MMC_DEV]

Select CONFIG_FASTBOOT_FLASH, CONFIG_FASTBOOT_FLASH_MMC_DEV
for rockchip SoC plaforms in fastboot Kconfig file instead
of defined it in board defconfig.

This eventually drop the explicit configs defined in
supporting board defconfig files.

Tested-by: Levin Du <djw@t-chip.com.cn>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/fastboot/Kconfig b/drivers/fastboot/Kconfig
index d63ecdd..34864ca 100644
--- a/drivers/fastboot/Kconfig
+++ b/drivers/fastboot/Kconfig
@@ -64,7 +64,7 @@
 
 config FASTBOOT_FLASH
 	bool "Enable FASTBOOT FLASH command"
-	default y if ARCH_SUNXI
+	default y if ARCH_SUNXI || ARCH_ROCKCHIP
 	depends on MMC || (NAND && CMD_MTDPARTS)
 	select IMAGE_SPARSE
 	help
@@ -89,6 +89,8 @@
 config FASTBOOT_FLASH_MMC_DEV
 	int "Define FASTBOOT MMC FLASH default device"
 	depends on FASTBOOT_FLASH_MMC
+	default 1 if ROCKCHIP_RK3328
+	default 0 if ARCH_ROCKCHIP
 	default 0 if ARCH_SUNXI && MMC_SUNXI_SLOT_EXTRA = -1
 	default 1 if ARCH_SUNXI && MMC_SUNXI_SLOT_EXTRA != -1
 	help