MXC: rename mxc_map_io to architecture specific versions

This allows us to have more mapping functions for more than one
i.MX architecture in the kernel. As this is the earliest board
specific hook we have, also use it to set the cpu type.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx2/mx27ads.c

@@ -277,7 +277,7 @@ static struct map_desc mx27ads_io_desc[] __initdata = {
 
 static void __init mx27ads_map_io(void)
 {
-	mxc_map_io();
+	mx27_map_io();
 	iotable_init(mx27ads_io_desc, ARRAY_SIZE(mx27ads_io_desc));
 }