MIPS: Loongson64: DTS: Add GMAC support for LS7A PCH

The GMAC module is now supported, enable it.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/mips/boot/dts/loongson/ls7a-pch.dtsi

@@ -186,7 +186,8 @@ gmac@3,0 {
 				compatible = "pci0014,7a03.0",
 						   "pci0014,7a03",
 						   "pciclass020000",
-						   "pciclass0200";
+						   "pciclass0200",
+						   "loongson, pci-gmac";
 
 				reg = <0x1800 0x0 0x0 0x0 0x0>;
 				interrupts = <12 IRQ_TYPE_LEVEL_HIGH>,
@@ -208,7 +209,8 @@ gmac@3,1 {
 				compatible = "pci0014,7a03.0",
 						   "pci0014,7a03",
 						   "pciclass020000",
-						   "pciclass0200";
+						   "pciclass0200",
+						   "loongson, pci-gmac";
 
 				reg = <0x1900 0x0 0x0 0x0 0x0>;
 				interrupts = <14 IRQ_TYPE_LEVEL_HIGH>,