armv7: add appropriate headers for assembly functions

Use ENTRY and ENDPROC with assembly functions to ensure
necessary assembler directives for all functions.

Signed-off-by: Aneesh V <aneesh@ti.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/arm/cpu/armv7/mx6/lowlevel_init.S b/arch/arm/cpu/armv7/mx6/lowlevel_init.S
index 1864356..acadef2 100644
--- a/arch/arm/cpu/armv7/mx6/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/mx6/lowlevel_init.S
@@ -18,7 +18,8 @@
  */
 .section ".text.init", "x"
 
-.globl lowlevel_init
-lowlevel_init:
+#include <linux/linkage.h>
 
+ENTRY(lowlevel_init)
 	mov pc, lr
+ENDPROC(lowlevel_init)