Nokia RX-51: Use ENTRY/ENDPROC for save_boot_params

ENTRY/ENDPROC macros from linux/linkage.h will make code more readable and
also will properly mark assembly symbol in ELF binary as function symbol.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/board/nokia/rx51/lowlevel_init.S b/board/nokia/rx51/lowlevel_init.S
index 930052e..44f32f1 100644
--- a/board/nokia/rx51/lowlevel_init.S
+++ b/board/nokia/rx51/lowlevel_init.S
@@ -5,6 +5,7 @@
  */
 
 #include <config.h>
+#include <linux/linkage.h>
 
 kernoffs:		/* offset of kernel image from this address */
 	.word . - CONFIG_TEXT_BASE - KERNEL_OFFSET
@@ -29,8 +30,7 @@
  * Description: Copy attached kernel to address KERNEL_ADDRESS
  */
 
-.global save_boot_params
-save_boot_params:
+ENTRY(save_boot_params)
 
 /*
  * Copy valid attached kernel to absolute address KERNEL_ADDRESS
@@ -93,3 +93,5 @@
 
 	/* Returns */
 	b	save_boot_params_ret
+
+ENDPROC(save_boot_params)