ARM: imx51: Add pinctrl for ecspi2

Add ecspi2 group of pins for imx51.
Signed-off-by: NGwenhael Goavec-Merou <gwenhael.goavec-merou@armadeus.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx51.dtsi

@@ -317,6 +317,16 @@
 					};
 				};
 
+				ecspi2 {
+					pinctrl_ecspi2_1: ecspi2grp-1 {
+						fsl,pins = <
+							MX51_PAD_NANDF_RB3__ECSPI2_MISO 0x185
+							MX51_PAD_NANDF_D15__ECSPI2_MOSI 0x185
+							MX51_PAD_NANDF_RB2__ECSPI2_SCLK 0x185
+						>;
+					};
+				};
+
 				esdhc1 {
 					pinctrl_esdhc1_1: esdhc1grp-1 {
 						fsl,pins = <