Add support for split wiphy dump to Wireless Toolbar

To populate the Wireless Toolbar menu the NL80211_CMD_GET_WIPHY
command is used. Some network interfaces must use split wiphy dump
feature for this command to function properly. One such example is the
D-Link DWA-160 USB adapter that does not show up when used without.

Make use of split wiphy dump feature whenever kernel supports it
to populate the list of monitor interfaces for the Wireless Toolbar.

Bug: 10564
Change-Id: Idc28e92f91a2488fa48eeb282a0ef1e2bd40a5f0
Reviewed-on: https://code.wireshark.org/review/4611
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>