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/rk3288/Kconfig b/arch/arm/mach-rockchip/rk3288/Kconfig
index 0dc5123..a03b36b 100644
--- a/arch/arm/mach-rockchip/rk3288/Kconfig
+++ b/arch/arm/mach-rockchip/rk3288/Kconfig
@@ -139,6 +139,9 @@
 	  voltage. This option is only available on boards which support it
 	  and have the required PMIC code.
 
+config ROCKCHIP_BOOT_MODE_REG
+	default 0xff730094
+
 config SYS_SOC
 	default "rk3288"