modules: update OpenWrt

514a4b3e1b4e include/feeds.mk: rework generation of opkg distfeeds.conf
3e89f58a5ead base-files: fix feed list in PKG_CONFIG_DEPENDS
7fa7c854fe33 include/feeds.mk: always add available feeds to PACKAGE_SUBDIRS
a5b9553cf592 scripts/feeds: add src-dummy method
2f306873efbe ramips: TP-Link TL-WR902AC v3: add missing wps button
36a4681b2bef ramips: TP-Link TL-WR902AC v3: don't build factory image
ca903c73c705 kernel: bump 4.14 to 4.14.54 for 18.06
3a5498c5e55d kernel: bump 4.9 to 4.9.111 for 18.06
27014da237f1 mac80211: Expose support for ath9k Dynack
5a40fad22a39 kernel: bcm47xxpart: fix getting user-space data partition name