modules: update LEDE

aaecfecdcd kernel: bump kernel 4.4 to version 4.4.139
b08003223a base-files: fix links in banner.failsafe
71019a7605 ar71xx: fix 5 GHz Wi-Fi on NBG6716
ba5c0a1dea Revert "base-files: fix UCI config parsing and callback handling"
5c6a8a9cdb kernel: bump kernel 4.4 to version 4.4.138
cf4a37a581 uci: add missing 'option' support to uci_rename()
7fc94b2a25 mac80211: rt2x00: no longer use TXOP_BACKOFF for probe frames
b03826d8aa kernel: bump kernel 4.4 to version 4.4.137
21f44e3389 map: add ealen as configurable uci parameter

Signed-off-by: Christoph Krapp <achterin@googlemail.com>