mt76: mt7603: add additional EEPROM chip ID

Some newer MT7628 based routers (notably the TP-Link Archer C50 v4) are
shipped with a chip-id of 0x7600 in the on-flash EEPROM. Add this as a
possible valid ID.

Ref: https://bugs.openwrt.org/index.php?do=details&task_id=2781

Suggested-by: Ron Asimi <[email protected]>
Signed-off-by: David Bauer <[email protected]>
(cherry picked from commit 9a1a0a4dec)

mt7603/eeprom.c

@@ -136,6 +136,7 @@ static int mt7603_check_eeprom(struct mt76_dev *dev)
 	switch (val) {
 	case 0x7628:
 	case 0x7603:
+	case 0x7600:
 		return 0;
 	default:
 		return -EINVAL;