arm: dts: k3-am642-evm-u-boot: Add U-Boot tags and fix the dr_mode to peripheral for USB subsystem

Add U-Boot tags and fix the dr_mode as peripheral in U-Boot to support DFU
by default.
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20210604163043.12811-8-a-govindraju@ti.com

arch/arm/dts/k3-am642-evm-u-boot.dtsi

@@ -50,6 +50,19 @@
 	u-boot,dm-spl;
 };
 
+&usb0 {
+	dr_mode="peripheral";
+	u-boot,dm-spl;
+};
+
+&usbss0 {
+	u-boot,dm-spl;
+};
+
+&main_usb0_pins_default {
+	u-boot,dm-spl;
+};
+
 &dmss {
 	u-boot,dm-spl;
 };