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/rk3368/Kconfig b/arch/arm/mach-rockchip/rk3368/Kconfig
index 31ef243..141d2f6 100644
--- a/arch/arm/mach-rockchip/rk3368/Kconfig
+++ b/arch/arm/mach-rockchip/rk3368/Kconfig
@@ -42,6 +42,9 @@
          sensor STK3410.
 endchoice
 
+config ROCKCHIP_BOOT_MODE_REG
+	default 0xff738200
+
 config SYS_SOC
 	default "rk3368"