[ARM] pxa: increase size of memory mapping

The mapping for physical address 0x48000000 is not sufficient
to allow access to the dynamic memory controller configuration
registers on PXA3.  These registers need to be accessed to
reconfigure the SDRAM when waking from a low power mode.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/generic.c

@@ -196,7 +196,7 @@ static struct map_desc standard_io_desc[] __initdata = {
 	}, {	/* Mem Ctl */
 		.virtual	=  0xf6000000,
 		.pfn		= __phys_to_pfn(0x48000000),
-		.length		= 0x00100000,
+		.length		= 0x00200000,
 		.type		= MT_DEVICE
 	}, {	/* USB host */
 		.virtual	=  0xf8000000,