s3c64xx: move s3c64xx header files to asm-arm/arch-s3c64xx

This patch moves the s3c64xx header files from include/
to include/asm-arm/arch-s3c64xx

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/cpu/arm1176/s3c64xx/speed.c b/cpu/arm1176/s3c64xx/speed.c
index 5c335a5..11962ac 100644
--- a/cpu/arm1176/s3c64xx/speed.c
+++ b/cpu/arm1176/s3c64xx/speed.c
@@ -31,7 +31,7 @@
  */
 
 #include <common.h>
-#include <s3c6400.h>
+#include <asm/arch/s3c6400.h>
 
 #define APLL 0
 #define MPLL 1