rockchip: rk3288: enable TPL for evb-rk3288

Enable TPL for evb-rk3288 so that we can have a free size limited
SPL.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3288/Kconfig b/arch/arm/mach-rockchip/rk3288/Kconfig
index 57b7962..de8d9c2 100644
--- a/arch/arm/mach-rockchip/rk3288/Kconfig
+++ b/arch/arm/mach-rockchip/rk3288/Kconfig
@@ -47,6 +47,7 @@
 config TARGET_EVB_RK3288
 	bool "Evb-RK3288"
 	select BOARD_LATE_INIT
+	select TPL
 	help
 	  EVB-RK3288 is a RK3288-based development board with 2 USB ports,
 	  HDMI, VGA, micro-SD card, audio, WiFi  and Gigabit Ethernet, It