ramips: add 'lwlll' portmap to mt7530 switch

The Xiaomi Mi Router 3G uses this deranged vlan portmap. Add support so
that packets are not leaked across all switch ports when reset.

Fix a whitespace nit while we're here.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
[fix wrong pvids order]
Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/ramips/files-4.9/drivers/net/ethernet/mtk/mt7530.c

@@ -220,6 +220,12 @@ struct mt7530_mapping {
 		.members = { 0, 0x7e, 0x41 },
 		.etags = { 0, 0x40, 0x40 },
 		.vids = { 0, 1, 2 },
+	}, {
+		.name = "lwlll",
+		.pvids = { 1, 2, 1, 1, 1, 1, 1 },
+		.members = { 0, 0x7d, 0x42 },
+		.etags = { 0, 0x40, 0x40 },
+		.vids = { 0, 1, 2 },
 	},
 };