ARM: imx/iomux-v3: allow pad_list to be const

Also fix all machine files to make use of it and while at it also make
the pad lists __initconst.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/iomux-v3.h

@@ -131,7 +131,8 @@ int mxc_iomux_v3_setup_pad(iomux_v3_cfg_t pad);
  * setups mutliple pads
  * convenient way to call the above function with tables
  */
-int mxc_iomux_v3_setup_multiple_pads(iomux_v3_cfg_t *pad_list, unsigned count);
+int mxc_iomux_v3_setup_multiple_pads(const iomux_v3_cfg_t *pad_list,
+		unsigned count);
 
 /*
  * Initialise the iomux controller