ARM: dts: imx23: 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/imx23-evk.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/gpmi-pins-fixup missing or empty reg/ranges property
arch/arm/boot/dts/imx23-evk.dtb: Warning (simple_bus_reg): Node /apb@80000000/apbh@80000000/pinctrl@80018000/mmc0-pins-fixup missing or empty reg/ranges property
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx23.dtsi

@@ -222,7 +222,8 @@ MX23_PAD_GPMI_CE0N__GPMI_CE0N
 					fsl,pull-up = <MXS_PULL_DISABLE>;
 				};
 
-				gpmi_pins_fixup: gpmi-pins-fixup {
+				gpmi_pins_fixup: gpmi-pins-fixup@0 {
+					reg = <0>;
 					fsl,pinmux-ids = <
 						MX23_PAD_GPMI_WPN__GPMI_WPN
 						MX23_PAD_GPMI_WRN__GPMI_WRN
@@ -266,7 +267,8 @@ MX23_PAD_SSP1_SCK__SSP1_SCK
 					fsl,pull-up = <MXS_PULL_ENABLE>;
 				};
 
-				mmc0_pins_fixup: mmc0-pins-fixup {
+				mmc0_pins_fixup: mmc0-pins-fixup@0 {
+					reg = <0>;
 					fsl,pinmux-ids = <
 						MX23_PAD_SSP1_DETECT__SSP1_DETECT
 						MX23_PAD_SSP1_SCK__SSP1_SCK