ARM: imx: get rid of mxc_gpio_init

This function is defined once for each imx family and so is in the way
when compiling a kernel for more than one SoC.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/mach-mx3/mm.c b/arch/arm/mach-mx3/mm.c
index 6858a4f..595cf09 100644
--- a/arch/arm/mach-mx3/mm.c
+++ b/arch/arm/mach-mx3/mm.c
@@ -97,8 +97,11 @@
 }
 #endif
 
+int imx3x_register_gpios(void);
+
 void __init mx31_init_irq(void)
 {
+	imx3x_register_gpios();
 	mxc_init_irq(IO_ADDRESS(AVIC_BASE_ADDR));
 }