[][Add non-DSA MT7531 driver support on Panther]

[Description]
Add non-DSA MT7531 driver support on Panther for 2.5G LAN/WAN
peak throughput test without additional 4-bytes special tag
used by DSA switch driver.

Driver difference:
DSA: "lan0" to "lan5" network interface for each switch port.
Non-DSA: "eth0" for all LAN ports, "eth1" for WAN port.

[Release-log]
N/A

Change-Id: I27a3efd10d1bc1709a4123331266adbf04b2ca7f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5422351
diff --git a/target/linux/mediatek/mt7986/base-files/etc/board.d/02_network b/target/linux/mediatek/mt7986/base-files/etc/board.d/02_network
index 0fd89a5..0b61e50 100755
--- a/target/linux/mediatek/mt7986/base-files/etc/board.d/02_network
+++ b/target/linux/mediatek/mt7986/base-files/etc/board.d/02_network
@@ -14,6 +14,11 @@
 		ucidef_add_switch "switch0" \
 			"0:lan" "1:lan" "2:lan" "3:lan" "4:wan" "6u@eth0" "5u@eth1"
 		;;
+	*gsw*)
+		ucidef_set_interfaces_lan_wan "eth0" "eth1"
+		ucidef_add_switch "switch0" \
+			"0:lan" "1:lan" "2:lan" "3:lan" "4:lan" "5:lan" "6u@eth0"
+		;;
 	*)
 		ucidef_set_interfaces_lan_wan "lan0 lan1 lan2 lan3 lan4 lan5" eth1
 		;;