sparc32: fix sparse warning in init_32.c

Fix following warning:
init_32.c:112:22: warning: symbol 'bootmem_init' was not declared. Should it be static?

Fix by adding a proper prototype in pgtable_32.h and drop
the local prototype in srmmu.c
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/asm/pgtable_32.h

@@ -27,6 +27,7 @@ struct page;
 
 extern void load_mmu(void);
 extern unsigned long calc_highpages(void);
+unsigned long __init bootmem_init(unsigned long *pages_avail);
 
 #define pte_ERROR(e)   __builtin_trap()
 #define pmd_ERROR(e)   __builtin_trap()

arch/sparc/mm/srmmu.c

@@ -865,8 +865,6 @@ static void __init map_kernel(void)
 
 void (*poke_srmmu)(void) = NULL;
 
-extern unsigned long bootmem_init(unsigned long *pages_avail);
-
 void __init srmmu_paging_init(void)
 {
 	int i;