ARM: imx: use __iomem pointers for MMIO

ARM is moving to stricter checks on readl/write functions,
so we need to use the correct types everywhere.

This found a bug in mach-armadillo5x0.c, where we attempt mmio
on the MXC_CCM_RCSR address that is currently defined to 0xc
and consequently causes an illegal address access.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/mach-imx/mach-mx31lite.c b/arch/arm/mach-imx/mach-mx31lite.c
index c8785b3..ef57cff 100644
--- a/arch/arm/mach-imx/mach-mx31lite.c
+++ b/arch/arm/mach-imx/mach-mx31lite.c
@@ -207,7 +207,7 @@
  */
 static struct map_desc mx31lite_io_desc[] __initdata = {
 	{
-		.virtual = MX31_CS4_BASE_ADDR_VIRT,
+		.virtual = (unsigned long)MX31_CS4_BASE_ADDR_VIRT,
 		.pfn = __phys_to_pfn(MX31_CS4_BASE_ADDR),
 		.length = MX31_CS4_SIZE,
 		.type = MT_DEVICE