ARM: imx: remove last explicit users of virtual base address defines

This allows changing the mapping without the need to adapt all users.

While at it remove some unneeded casts to void __iomem *, this is already
taken care for in the IO_ADDRESS macros

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/mach-mx25/mm.c b/arch/arm/mach-mx25/mm.c
index 11cd335..2edec6c 100644
--- a/arch/arm/mach-mx25/mm.c
+++ b/arch/arm/mach-mx25/mm.c
@@ -56,7 +56,7 @@
 
 void __init mx25_init_irq(void)
 {
-	mxc_init_irq((void __iomem *)MX25_AVIC_BASE_ADDR_VIRT);
+	mxc_init_irq(MX25_IO_ADDRESS(MX25_AVIC_BASE_ADDR));
 	imx25_register_gpios();
 }