rockchip: move ROCKCHIP_STIMER_BASE to Kconfig

Move ROCKCHIP_STIMER_BASE to Kconfig.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-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 f37b1bd..dd8c782 100644
--- a/arch/arm/mach-rockchip/rk3288/Kconfig
+++ b/arch/arm/mach-rockchip/rk3288/Kconfig
@@ -148,6 +148,9 @@
 config ROCKCHIP_BOOT_MODE_REG
 	default 0xff730094
 
+config ROCKCHIP_STIMER_BASE
+	default 0xff810020
+
 config SYS_SOC
 	default "rk3288"