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 <ron.asimi@gmail.com>
Signed-off-by: David Bauer <mail@david-bauer.net>

package/kernel/mt76/patches/002-mt76-mt7603-add-additional-EEPROM-chip-ID.patch

@@ -0,0 +1,27 @@
+From 6b51340cdc32b1ba75163faaa8592feaeb4bddec Mon Sep 17 00:00:00 2001
+From: David Bauer <mail@david-bauer.net>
+Date: Sat, 10 Oct 2020 00:36:02 +0200
+Subject: [PATCH] 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 <ron.asimi@gmail.com>
+Signed-off-by: David Bauer <mail@david-bauer.net>
+---
+ mt7603/eeprom.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/mt7603/eeprom.c
++++ b/mt7603/eeprom.c
+@@ -136,6 +136,7 @@ static int mt7603_check_eeprom(struct mt
+ 	switch (val) {
+ 	case 0x7628:
+ 	case 0x7603:
++	case 0x7600:
+ 		return 0;
+ 	default:
+ 		return -EINVAL;