brcm63xx: probe gpio controllers through DT

Add a generic mmio gpio controller based driver and probe it
through device tree.

Use aliases for base calculation until we converted all users to
device tree or named gpios.

Convert bcm63xx_enet's ephy-reset gpio to use a named gpio.

While at it, remove the duplicate reset gpio defintion for livebox.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 44565

target/linux/brcm63xx/dts/bcm6338.dtsi

@@ -5,6 +5,7 @@
 
 	aliases {
 		pflash = &pflash;
+		gpio0 = &gpio0;
 	};
 
 	cpus {
@@ -65,5 +66,15 @@
 			interrupt-parent = <&cpu_intc>;
 			interrupts = <3>, <4>, <5>, <6>;
 		};
+
+		gpio0: gpio-controller@fffe0404 {
+			compatible = "brcm,bcm6345-gpio";
+			reg = <0xfffe0404 4>, <0xfffe040c 4>;
+
+			gpio-controller;
+			#gpio-cells = <2>;
+
+			ngpios = <8>;
+		};
 	};
 };