ramips: enable additional GPIOs on HAME MPR-A1

According to the pcb tracing results[1] by anton.rad[2] MPR-A1s expose
6 unused GPIOs, only one of them working as configured in the current
DTS. This patch enables GPIO22-26.

Tested on hardware.

[1] http://i.imgur.com/kHVW2Ox.jpg
[2] https://forum.openwrt.org/viewtopic.php?pid=222698#p222698

Signed-off-by: Paul Fertser <fercerpav@gmail.com>

SVN-Revision: 42178

target/linux/ramips/dts/MPRA1.dts

@@ -41,12 +41,15 @@
 				};
 			};
 		};
+		gpio1: gpio@660 {
+			status = "okay";
+		};
 	};
 
 	pinctrl {
 		state_default: pinctrl0 {
 			gpio {
-				ralink,group = "i2c", "jtag", "rgmii", "mdio", "uartf";
+				ralink,group = "i2c", "jtag", "rgmii", "mdio", "uartf", "led";
 				ralink,function = "gpio";
 			};
 		};