arm/imx: remove cpu_is_xxx() check from __imx_ioremap()

This patch adds an ioremap hook imx_ioremap to be called in
__imx_ioremap().  Any soc that needs a customized ioremap other
than __arm_ioremap() can set up this hook in soc specific call.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/plat-mxc/system.c b/arch/arm/plat-mxc/system.c
index 5fa03e7..9dad8dc 100644
--- a/arch/arm/plat-mxc/system.c
+++ b/arch/arm/plat-mxc/system.c
@@ -29,6 +29,7 @@
 #include <asm/mach-types.h>
 
 void (*imx_idle)(void) = NULL;
+void __iomem *(*imx_ioremap)(unsigned long, size_t, unsigned int) = NULL;
 
 static void __iomem *wdog_base;