sh: Fix page size alignment in __copy_user_page().

SH-3 comes up with the PAGE_SIZE on a misaligned boundary:

arch/sh/mm/copy_page.S: Assembler messages:
arch/sh/mm/copy_page.S:132: Warning: misaligned data

fix it up with explicit alignment.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/mm/copy_page.S

@@ -129,6 +129,7 @@ ENTRY(__copy_user_page)
 	rts
 	 nop
 #endif
+	.align 2
 .Lpsz:	.long	PAGE_SIZE
 /*
  * __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);