ARM: dts: imx27-phytec-phycore-som: Move PMIC IRQ GPIO into a separate pin group

The hardware is better described if we place the PMIC IRQ GPIO into its own
pingroup.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx27-phytec-phycore-som.dtsi

@@ -69,6 +69,8 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 		compatible = "fsl,mc13783";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_pmic>;
 		reg = <0>;
 		spi-cs-high;
 		spi-max-frequency = <20000000>;
@@ -204,7 +206,6 @@
 				MX27_PAD_CSPI1_MOSI__CSPI1_MOSI 0x0
 				MX27_PAD_CSPI1_SCLK__CSPI1_SCLK 0x0
 				MX27_PAD_CSPI1_SS0__GPIO4_28	0x0 /* SPI1 CS0 */
-				MX27_PAD_USB_PWR__GPIO2_23	0x0 /* PMIC IRQ */
 			>;
 		};
 
@@ -251,6 +252,12 @@
 			>;
 		};
 
+		pinctrl_pmic: pmicgrp {
+			fsl,pins = <
+				MX27_PAD_USB_PWR__GPIO2_23	0x0 /* PMIC IRQ */
+			>;
+		};
+
 		pinctrl_ssi1: ssi1grp {
 			fsl,pins = <
 				MX27_PAD_SSI1_FS__SSI1_FS 0x0