arm64: core support

Relocation code based on a patch by Scott Wood, which is:
Signed-off-by: Scott Wood <scottwood@freescale.com>

Signed-off-by: David Feng <fenghua@phytium.com.cn>
diff --git a/arch/arm/include/asm/byteorder.h b/arch/arm/include/asm/byteorder.h
index c3489f1..71a9966 100644
--- a/arch/arm/include/asm/byteorder.h
+++ b/arch/arm/include/asm/byteorder.h
@@ -23,10 +23,22 @@
 #  define __SWAB_64_THRU_32__
 #endif
 
+#ifdef	CONFIG_ARM64
+
+#ifdef __AARCH64EB__
+#include <linux/byteorder/big_endian.h>
+#else
+#include <linux/byteorder/little_endian.h>
+#endif
+
+#else	/* CONFIG_ARM64 */
+
 #ifdef __ARMEB__
 #include <linux/byteorder/big_endian.h>
 #else
 #include <linux/byteorder/little_endian.h>
 #endif
 
+#endif	/* CONFIG_ARM64 */
+
 #endif