powerpc/82xx: updates for mgcoge

Add:
 - Setup dts node for USB
 - pin description and setup for SMC1 (serial interface)

Update and cleanup mgcoge_defconfig:
- enable: TIPC, UBIFS, USB_GADGET driver, SQUASHFS, HIGHRES timers
          POSIX_MQUEUE, EMBEDDED
- disable: EXT3, PPC_PMAC

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Acked-by: Heiko Schocher <hs@denx.de>
cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/boot/dts/mgcoge.dts b/arch/powerpc/boot/dts/mgcoge.dts
index 1360d2f..ededaf5 100644
--- a/arch/powerpc/boot/dts/mgcoge.dts
+++ b/arch/powerpc/boot/dts/mgcoge.dts
@@ -213,6 +213,15 @@
 				linux,network-index = <2>;
 				fsl,cpm-command = <0x16200300>;
 			};
+
+			usb@11b60 {
+				compatible = "fsl,mpc8272-cpm-usb";
+				mode = "peripheral";
+				reg = <0x11b60 0x40 0x8b00 0x100>;
+				interrupts = <11 8>;
+				interrupt-parent = <&PIC>;
+				usb-clock = <5>;
+			};
 		};
 
 		cpm2_pio_c: gpio-controller@10d40 {