[POWERPC] Pointers marked as __iomem do not need to be volatile
Fixes this warning:
arch/powerpc/platforms/powermac/pci.c: In function 'u3_ht_cfg_access':
arch/powerpc/platforms/powermac/pci.c:354: warning: return discards qualifiers from pointer target type
arch/powerpc/platforms/powermac/pci.c:358: warning: return discards qualifiers from pointer target type
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>