rockchip: rk3288: Add a simple syscon driver

Add a driver that provides access to system controllers.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rk3288/Makefile b/arch/arm/mach-rockchip/rk3288/Makefile
index c6663f0..3f9900d 100644
--- a/arch/arm/mach-rockchip/rk3288/Makefile
+++ b/arch/arm/mach-rockchip/rk3288/Makefile
@@ -5,3 +5,4 @@
 #
 
 obj-y += reset_rk3288.o
+obj-y += syscon_rk3288.o