dra7: dtsi: mark ocp2scp bus compatible with "simple-bus"

This is needed to probe devices under that bus such as the SATA PHY.
Signed-off-by: NJean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: NTom Rini <trini@konsulko.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

arch/arm/dts/omap5-u-boot.dtsi

@@ -10,6 +10,10 @@
 /{
 	ocp {
 		u-boot,dm-pre-reloc;
+
+		ocp2scp@4a090000 {
+			compatible = "ti,omap-ocp2scp", "simple-bus";
+		};
 	};
 };