ARM: pxa: call debug_ll_io_init for earlyprintk

This is already done automatically for many other ARM platforms by the
ARM core code, but since pxa is using the .map_io callback, it needs to
call it explicitely for earlyprintk support.
Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>
Acked-by: Haojian Zhuang <haojian.zhuang@linaro.org>

arch/arm/mach-pxa/generic.c

@@ -93,5 +93,6 @@ static struct map_desc common_io_desc[] __initdata = {
 
 void __init pxa_map_io(void)
 {
+	debug_ll_io_init();
 	iotable_init(ARRAY_AND_SIZE(common_io_desc));
 }