ramips: mt7620: add missing pci wifi nodes to dts files

These devices has pci wifi but not defined in dts:
 HC5761
 HC5861
 TINY-AC

Signed-off-by: Chen Minqiang <ptpt52@gmail.com>

target/linux/ramips/dts/HC5761.dts

@@ -37,3 +37,11 @@
 		};
 	};
 };
+
+&pcie0 {
+	mt76@0,0 {
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};

target/linux/ramips/dts/HC5861.dts

@@ -97,3 +97,11 @@
 &gsw {
 	mediatek,port4 = "gmac";
 };
+
+&pcie0 {
+	mt76@0,0 {
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};

target/linux/ramips/dts/TINY-AC.dts

@@ -161,3 +161,11 @@
 		};
 	};
 };
+
+&pcie0 {
+	mt76@0,0 {
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};