dts: qcs6490-rb3gen2-u-boot: USB host mode

Adjust DTS so USB runs in host mode. The type-c port is the only
supported port (since the others need PCIe). Booting from USB is
possible with a powered type-c dock.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/arch/arm/dts/qcs6490-rb3gen2-u-boot.dtsi b/arch/arm/dts/qcs6490-rb3gen2-u-boot.dtsi
index c3ec4a3..fbe7259 100644
--- a/arch/arm/dts/qcs6490-rb3gen2-u-boot.dtsi
+++ b/arch/arm/dts/qcs6490-rb3gen2-u-boot.dtsi
@@ -17,6 +17,11 @@
 	};
 };
 
+&usb_1_dwc3 {
+	dr_mode = "host";
+	/delete-property/ usb-role-switch;
+};
+
 // RAM Entry 0 : Base 0x0080000000  Size 0x003A800000
 // RAM Entry 1 : Base 0x00C0000000  Size 0x0001800000
 // RAM Entry 2 : Base 0x00C3400000  Size 0x003CC00000