ARM: dts: DRA72x: Use PCIe compatible specific to dra72

Use dra72 specific compatible string for PCIe while preserving
the older compatible.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra72x.dtsi

@@ -50,3 +50,15 @@ mbox_ipu2_ipc3x: mbox_ipu2_ipc3x {
 		status = "disabled";
 	};
 };
+
+&pcie1_rc {
+	compatible = "ti,dra726-pcie-rc", "ti,dra7-pcie";
+};
+
+&pcie1_ep {
+	compatible = "ti,dra726-pcie-ep", "ti,dra7-pcie-ep";
+};
+
+&pcie2_rc {
+	compatible = "ti,dra726-pcie-rc", "ti,dra7-pcie";
+};