MT7621 USB phys are compatible with the MediaTek T-PHY controller.
The vendor SDK also enabled this driver for MT7621.
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/22094
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>