rockchip: rk3399: Enable TPL_BOARD_INIT

Enable TPL_BOARD_INIT, this would help us to show
TPL boot prints.
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>
Reviewed-by: NKever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/Kconfig

@@ -191,6 +191,7 @@ config ROCKCHIP_RK3399
 	imply TPL_LIBCOMMON_SUPPORT
 	imply TPL_LIBGENERIC_SUPPORT
 	imply TPL_SYS_MALLOC_SIMPLE
+	imply TPL_BOARD_INIT
 	imply TPL_BOOTROM_SUPPORT
 	imply TPL_DRIVERS_MISC_SUPPORT
 	imply TPL_OF_CONTROL