rockchip: Kconfig: move ROCKCHIP_BOOT_MODE_REG to soc Kconfig

Rockchip SoCs have different ROCKCHIP_BOOT_MODE_REG value,
move it to SoC's own Kconfig, and add address for rk3128 and
rk3328 so that all SoCs have available address.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3188/Kconfig b/arch/arm/mach-rockchip/rk3188/Kconfig
index a6fc691..e24e68e 100644
--- a/arch/arm/mach-rockchip/rk3188/Kconfig
+++ b/arch/arm/mach-rockchip/rk3188/Kconfig
@@ -9,6 +9,9 @@
 	  Expansion connectors provide access to display pins, I2C, SPI,
 	  UART and GPIOs.
 
+config ROCKCHIP_BOOT_MODE_REG
+	default 0x20004040
+
 config SYS_SOC
 	default "rk3188"