modules: update OpenWrt

62feabecd8 kernel: bump 4.14 to 4.14.99
9fb3710a8b kernel: bump 4.9 to 4.9.156
e5ace80759 mt76: update to the latest version
fbb2186fbd kernel: bump 4.14 to 4.14.98
72870cc108 kernel: bump 4.9 to 4.9.155
19a6c4b2b3 mac80211: brcmfmac: fix a possible NULL pointer dereference
d997712c71 ath9k: register GPIO chip for OF targets

Compile-tested: ipq40xx, ramips-mt7621
Runtime-tested: none