powerpc: fix up for mmu_mapin_ram api change

Today's linux-next build (powerpc ppc44x_defconfig) failed like this:

arch/powerpc/mm/pgtable_32.c: In function 'mapin_ram':
arch/powerpc/mm/pgtable_32.c:318: error: too many arguments to function 'mmu_mapin_ram'

Casued by commit de32400dd26e743c5d500aa42d8d6818b79edb73 ("wii: use both
mem1 and mem2 as ram").

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/arch/powerpc/mm/40x_mmu.c b/arch/powerpc/mm/40x_mmu.c
index f5e7b9c..08dfa8e 100644
--- a/arch/powerpc/mm/40x_mmu.c
+++ b/arch/powerpc/mm/40x_mmu.c
@@ -91,7 +91,7 @@
 #define LARGE_PAGE_SIZE_16M	(1<<24)
 #define LARGE_PAGE_SIZE_4M	(1<<22)
 
-unsigned long __init mmu_mapin_ram(void)
+unsigned long __init mmu_mapin_ram(unsigned long top)
 {
 	unsigned long v, s, mapped;
 	phys_addr_t p;