rockchip: correct ARCH_SOC name

The ARCH_SOC name default as 'rockchip' and we put all the
header file in 'arch/arm/include/asm/arch-rockchip/', but
the 'rockchip' is not the SOC name, let's correct it after
we update all the source file.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsiich <philipp.tomsich@theobroma-systems.com>
diff --git a/arch/arm/mach-rockchip/rk3368/Kconfig b/arch/arm/mach-rockchip/rk3368/Kconfig
index 7c9b722..325572a 100644
--- a/arch/arm/mach-rockchip/rk3368/Kconfig
+++ b/arch/arm/mach-rockchip/rk3368/Kconfig
@@ -43,7 +43,7 @@
 endchoice
 
 config SYS_SOC
-	default "rockchip"
+	default "rk3368"
 
 source "board/theobroma-systems/lion_rk3368/Kconfig"
 source "board/rockchip/sheep_rk3368/Kconfig"