[ARM] ohci-pxa27x: use ioremap() and offset for register access

This avoid the pre-mapping of OHCI controller register space, and the
mapping is made only when necessary (OHCI is probed).

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/generic.c

@@ -88,11 +88,6 @@ static struct map_desc standard_io_desc[] __initdata = {
 		.pfn		= __phys_to_pfn(0x48000000),
 		.length		= 0x00200000,
 		.type		= MT_DEVICE
-	}, {	/* USB host */
-		.virtual	=  0xf8000000,
-		.pfn		= __phys_to_pfn(0x4c000000),
-		.length		= 0x00100000,
-		.type		= MT_DEVICE
 	}, {	/* Camera */
 		.virtual	=  0xfa000000,
 		.pfn		= __phys_to_pfn(0x50000000),