ARM: dts: dra7: Add usb peripheral nodes in spl

Add usb peripheral and usb phy nodes in spl to enable SPL_DFU bootmode.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
diff --git a/arch/arm/dts/omap5-u-boot.dtsi b/arch/arm/dts/omap5-u-boot.dtsi
index 1b1d765..39071e2 100644
--- a/arch/arm/dts/omap5-u-boot.dtsi
+++ b/arch/arm/dts/omap5-u-boot.dtsi
@@ -22,6 +22,7 @@
 
 		ocp2scp@4a080000 {
 			compatible = "ti,omap-ocp2scp", "simple-bus";
+			u-boot,dm-spl;
 		};
 
 		ocp2scp@4a090000 {