[POWERPC] mpc8349emitx.dts: Setup USB-DR for peripheral mode.

Setup dr_mode for USB-DR to peripheral as the default (host mode) doesn't make
much sense for the mini-AB connector on the ITX board.

Peripheral mode is preferable to OTG as the fsl_usb2_udc.c driver doesn't yet
properly support it.

Signed-off-by: Peter Korsgaard <[e-mail]>
Signed-off-by: Kumar Gala <[e-mail]>

arch/powerpc/boot/dts/mpc8349emitx.dts

···
 			#size-cells = <0>;
 			interrupt-parent = < &ipic >;
 			interrupts = <26 8>;
+			dr_mode = "peripheral";
 			phy_type = "ulpi";
 		};