modules: update OpenWrt

ef686b7292 uqmi: bump to latest git HEAD
3dc740257b uqmi: inherit firewall zone membership to virtual sub interfaces
a2c22b8776 uqmi: fix PIN_STATUS_FAILED error with MC7455 WCDMA/LTE modem
d5ff0897cb kernel: bump 4.14 to 4.14.131
18266fc6c0 kernel: bump 4.9 to 4.9.184

Compile-tested: mpc85xx-generic, ramips-mt7621
Runtime-tested: mpc85xx-generic (TP-Link WDR4900 v1), ramips-mt7621 (D-Link DIR-860L B1)