I have only customized openwrt on the MT7620A-based devices, without opkg. So
root@LEDE:~# lsmod | grep mt7
cfg80211 233784 5 rt2x00lib,mt76x2e,mt7603e,mt76,mac80211
mac80211 414818 7 rt2800lib,rt2x00soc,rt2x00pci,rt2x00lib,mt76x2e,mt7603e,mt76
mt76 16271 2 mt76x2e,mt7603e
mt7603e 29312 0
mt76x2e 40760 0
This is running new 17.1.0.4