UPSTREAM: mac80211: don't put null-data frames on the normal TXQ

Since (QoS) NDP frames shouldn't be put into aggregation nor are
assigned real sequence numbers, etc. it's better to treat them as
non-data packets and not put them on the normal TXQs, for example
when building A-MPDUs they need to be treated specially, and they
are more used for management (e.g. to see if the station is alive)
anyway.

BUG=b:132147953
TEST=None

(cherry picked from commit 0832b603)
(source: https://git.kernel.org/cgit/linux/kernel/git/kvalo/ath.git

)

Change-Id: Ib042f0f45d509b94f35d1124e85b42e2c30661f6
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Balaji Pothunoori <bpothuno@codeaurora.org>
Signed-off-by: Vamsi Singamsetty <vamssi@codeaurora.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1642725


Reviewed-by: Julan Hsu <julanhsu@google.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Tested-by: Julan Hsu <julanhsu@google.com>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>