ARM: dts: imx28-tx28: Pass unit address and reg to IOMUX node

Pass unit address and reg to IOMUX node to fix the following build
warning with W=1:

arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-edt-ft5x06-pins missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-flexcan-xcvr-pins missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-lcdif-23bit missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-lcdif-ctrl missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-mac0-gpio-pins missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-pca9554-pins missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/spi-gpiogrp missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-tsc2007-pins missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-usbphy0-pins missing or empty reg/ranges property
arch/arm/boot/dts/imx28-tx28.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/tx28-usbphy1-pins missing or empty reg/ranges property

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-By: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>