ARM: imx: Remove unneeded .map_io initialization

If machine_desc.map_io is not set, devicemaps_init() in the common ARM
code will call debug_ll_io_init().
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/mach-imx6sl.c

@@ -74,7 +74,6 @@ static const char * const imx6sl_dt_compat[] __initconst = {
 };
 
 DT_MACHINE_START(IMX6SL, "Freescale i.MX6 SoloLite (Device Tree)")
-	.map_io		= debug_ll_io_init,
 	.init_irq	= imx6sl_init_irq,
 	.init_machine	= imx6sl_init_machine,
 	.init_late      = imx6sl_init_late,

arch/arm/mach-imx/mach-imx6sx.c

@@ -51,7 +51,6 @@ static const char * const imx6sx_dt_compat[] __initconst = {
 };
 
 DT_MACHINE_START(IMX6SX, "Freescale i.MX6 SoloX (Device Tree)")
-	.map_io		= debug_ll_io_init,
 	.init_irq	= imx6sx_init_irq,
 	.init_machine	= imx6sx_init_machine,
 	.dt_compat	= imx6sx_dt_compat,