[MIPS] Add external declaration of pagetable_init() to pgalloc.h

This fixes some sparse warnings.

pgtable-32.c:15:6: warning: symbol 'pgd_init' was not declared. Should it be static?
pgtable-32.c:32:13: warning: symbol 'pagetable_init' was not declared. Should it be static?

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/mm/init.c

diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 125a4a8..13a4208 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -314,8 +314,6 @@
 }
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
-extern void pagetable_init(void);
-
 static int __init page_is_ram(unsigned long pagenr)
 {
 	int i;

arch/mips/mm/pgtable-32.c

diff --git a/arch/mips/mm/pgtable-32.c b/arch/mips/mm/pgtable-32.c
index 4a61e62..575e401 100644
--- a/arch/mips/mm/pgtable-32.c
+++ b/arch/mips/mm/pgtable-32.c
@@ -11,6 +11,7 @@
 #include <linux/highmem.h>
 #include <asm/fixmap.h>
 #include <asm/pgtable.h>
+#include <asm/pgalloc.h>
 
 void pgd_init(unsigned long page)
 {

arch/mips/mm/pgtable-64.c

diff --git a/arch/mips/mm/pgtable-64.c b/arch/mips/mm/pgtable-64.c
index c46eb65..e4b565a 100644
--- a/arch/mips/mm/pgtable-64.c
+++ b/arch/mips/mm/pgtable-64.c
@@ -10,6 +10,7 @@
 #include <linux/mm.h>
 #include <asm/fixmap.h>
 #include <asm/pgtable.h>
+#include <asm/pgalloc.h>
 
 void pgd_init(unsigned long page)
 {

arch/mips/sgi-ip27/ip27-memory.c

diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
index 0e3d535..fe8a106 100644
--- a/arch/mips/sgi-ip27/ip27-memory.c
+++ b/arch/mips/sgi-ip27/ip27-memory.c
@@ -21,6 +21,7 @@
 #include <linux/pfn.h>
 #include <linux/highmem.h>
 #include <asm/page.h>
+#include <asm/pgalloc.h>
 #include <asm/sections.h>
 
 #include <asm/sn/arch.h>
@@ -503,7 +504,6 @@
 	/* We got nothing to free here ...  */
 }
 
-extern void pagetable_init(void);
 extern unsigned long setup_zero_pages(void);
 
 void __init paging_init(void)