powerpc: wii: allow ioremap within the memory hole

Enable the flag that allows a platform to ioremap memory marked
as reserved.

This is currently needed on the Nintendo Wii video game console
due to the workaround introduced in "wii: use both mem1 and mem2 as ram".

This will no longer be needed when proper discontig memory support
for 32-bit PowerPC is added to the kernel.
Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

arch/powerpc/platforms/embedded6xx/wii.c

@@ -97,6 +97,9 @@ void __init wii_memory_fixups(void)
 
 	/* reserve the hole */
 	lmb_reserve(wii_hole_start, wii_hole_size);
+
+	/* allow ioremapping the address space in the hole */
+	__allow_ioremap_reserved = 1;
 }
 
 unsigned long __init wii_mmu_mapin_mem2(unsigned long top)