sh: Move entry point code to .text.head.

Follow Al Viro's m68k change from l-k:

	i.e. tell modpost that entry point code (that has to be outside
	of .init.text for external reasons) is OK to refer to .init.*

Shuts up some section mismatch warnings from modpost.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/head.S

@@ -36,7 +36,8 @@ ENTRY(empty_zero_page)
 1:
 	.skip	PAGE_SIZE - empty_zero_page - 1b
 
-	.text	
+	.section	.text.head, "ax"
+
 /*
  * Condition at the entry of _stext:
  *