ramips: mt7620/mt7621: remove invalid mediatek,portmap

mt7620 and mt7621 use mt7530 driver, which only accepts "llllw", "wllll",
and "lwlll" values.

According to its switch setup, Mi Router 3G v2 has a WAN port at port 4,
so the correct value should be "llllw".

Signed-off-by: Sungbo Eo <mans0n@gorani.run>

target/linux/ramips/dts/mt7620a_edimax_ew-747x.dtsi

@@ -122,7 +122,6 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&rgmii1_pins &mdio_pins &phy_reset_pins>;
 
-	mediatek,portmap = "l";
 	mediatek,mdio-mode = <1>;
 
 	phy-reset-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;

target/linux/ramips/dts/mt7620a_tplink_archer-mr200.dts

@@ -169,9 +169,8 @@
 };
 
 &ethernet {
-		mtd-mac-address = <&rom 0xf100>;
-		mediatek,portmap = "llll";
-	};
+	mtd-mac-address = <&rom 0xf100>;
+};
 
 &ehci {
 	status = "okay";

target/linux/ramips/dts/mt7621_xiaomi_mir3g-v2.dts

@@ -134,7 +134,7 @@
 
 &ethernet {
 	mtd-mac-address = <&factory 0xe000>;
-	mediatek,portmap = "lllwl";
+	mediatek,portmap = "llllw";
 };
 
 &state_default {