rockchip: enable rk322x TPL_BOOTROM_SUPPORT in Kconfig

The TPL_BOOTROM_SUPPORT is needed for boot from bootrom like
other storages.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index 2f0d741..17f31e8 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -59,6 +59,7 @@
 	select SPL_DRIVERS_MISC_SUPPORT
 	imply SPL_SERIAL_SUPPORT
 	imply TPL_SERIAL_SUPPORT
+	imply TPL_BOOTROM_SUPPORT
 	imply TPL_ROCKCHIP_COMMON_BOARD
 	select ROCKCHIP_BROM_HELPER
 	select TPL_LIBCOMMON_SUPPORT