ARM: i.MX53: add uart2 pinctrl

Add a group to the uart2 pinctrl.
Signed-off-by: NSteffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx53.dtsi

@@ -676,6 +676,15 @@
 							MX53_PAD_PATA_DMARQ__UART2_TXD_MUX     0x1c5
 						>;
 					};
+
+					pinctrl_uart2_2: uart2grp-2 {
+						fsl,pins = <
+							MX53_PAD_PATA_BUFFER_EN__UART2_RXD_MUX	0x1c5
+							MX53_PAD_PATA_DMARQ__UART2_TXD_MUX	0x1c5
+							MX53_PAD_PATA_DIOR__UART2_RTS		0x1c5
+							MX53_PAD_PATA_INTRQ__UART2_CTS		0x1c5
+						>;
+					};
 				};
 
 				uart3 {