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/rk3128/Kconfig b/arch/arm/mach-rockchip/rk3128/Kconfig
index b867401..9cc494e 100644
--- a/arch/arm/mach-rockchip/rk3128/Kconfig
+++ b/arch/arm/mach-rockchip/rk3128/Kconfig
@@ -16,6 +16,9 @@
 config ROCKCHIP_BOOT_MODE_REG
 	default 0x100a0038
 
+config ROCKCHIP_STIMER_BASE
+	default 0x200440a0
+
 config SYS_SOC
 	default "rk3128"