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/unaligned.h b/arch/arm/include/asm/unaligned.h
index 44593a8..0a228fb 100644
--- a/arch/arm/include/asm/unaligned.h
+++ b/arch/arm/include/asm/unaligned.h
@@ -8,7 +8,7 @@
 /*
  * Select endianness
  */
-#ifndef __ARMEB__
+#if __BYTE_ORDER == __LITTLE_ENDIAN
 #define get_unaligned	__get_unaligned_le
 #define put_unaligned	__put_unaligned_le
 #else