[MIPS] Add missing prototypes to asm/page.h

This patch fixes the following sparse warnings:

>>>>>>>>>>>>>>>>>>
arch/mips/mm/page.c:284:16: warning: symbol
'build_clear_page' was not declared. Should it be static?

arch/mips/mm/page.c:426:16: warning: symbol 'build_copy_page'
was not declared. Should it be static?
>>>>>>>>>>>>>>>>>>

The fix is to add appropriate prototypes to the header
include/asm-mips/page.h.

Build-tested against Malta defconfig.
Signed-off-by: NDmitri Vorobiev <dmitri.vorobiev@movial.fi>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

include/asm-mips/page.h

@@ -34,6 +34,9 @@
 #include <linux/pfn.h>
 #include <asm/io.h>
 
+extern void build_clear_page(void);
+extern void build_copy_page(void);
+
 /*
  * It's normally defined only for FLATMEM config but it's
  * used in our early mem init code for all memory models.