ARM: DTS: am335x-evm: Use USB0 in peripheral mode

This USB port is mainly used for RNDIS and DFU. To be able to use it with
DM_USB and DM_USB_GADGET, we need to provide a dr_mode value in the DTS.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/dts/am335x-evm-u-boot.dtsi b/arch/arm/dts/am335x-evm-u-boot.dtsi
index 0341600..b6b97ed 100644
--- a/arch/arm/dts/am335x-evm-u-boot.dtsi
+++ b/arch/arm/dts/am335x-evm-u-boot.dtsi
@@ -7,3 +7,7 @@
 &mmc3 {
 	status = "disabled";
 };
+
+&usb0 {
+	dr_mode = "peripheral";
+};