ARM: imx: iomux-v1.h: Fix build error due to __init annotation

Fix the following build error found when building imx_v4_v5_defconfig:

  CC      arch/arm/mach-imx/mach-imx27ipcam.o
In file included from arch/arm/plat-mxc/include/mach/iomux-mx27.h:23,
                 from arch/arm/mach-imx/mach-imx27ipcam.c:22:
arch/arm/plat-mxc/include/mach/iomux-v1.h:99: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'imx_iomuxv1_init'
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/plat-mxc/include/mach/iomux-v1.h

@@ -96,6 +96,6 @@ extern int mxc_gpio_mode(int gpio_mode);
 extern int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 		const char *label);
 
-extern int __init imx_iomuxv1_init(void __iomem *base, int numports);
+extern int imx_iomuxv1_init(void __iomem *base, int numports);
 
 #endif /* __MACH_IOMUX_V1_H__ */