LinuxKPI: 80211: improve linuxkpi_ieee80211_get_tid()

Continue what was started in 26a36948331bd08d9afaddfc0da724eacdb953dd
in iwlwifi and extend out internal implementation of
linuxkpi_ieee80211_get_tid() by an argument as to whether "no-QoS"
answers are acceptable. For the LinuxKPI ieee80211_get_tid() set
this to false as the Linux derived drivers seem to do extra checks
for the QoS-Data frame before acquiring the tid.
Add KASSERTs to enforce the extra argument.
This allows us to use the net80211 variant in LinuxKPI for other
means explicitly documenting that we do accept a IEEE80211_NONQOS_TID.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days