rockchip: use 'arch-rockchip' as header file path

Rockchip use 'arch-rockchip' instead of arch-$(SOC) as common
header file path, so that we can get the correct path directly.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/arch/arm/mach-rockchip/sdram_common.c b/arch/arm/mach-rockchip/sdram_common.c
index a271380..8684dbd 100644
--- a/arch/arm/mach-rockchip/sdram_common.c
+++ b/arch/arm/mach-rockchip/sdram_common.c
@@ -7,7 +7,7 @@
 #include <dm.h>
 #include <ram.h>
 #include <asm/io.h>
-#include <asm/arch/sdram_common.h>
+#include <asm/arch-rockchip/sdram_common.h>
 #include <dm/uclass-internal.h>
 
 DECLARE_GLOBAL_DATA_PTR;