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There are a few different tx paths depending on
firmware and frame itself.

Creating a uniform decision will make it possible
to switch between different txmode easier, both
for testing and for future features as well.
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Marek Puzyniak <marek.puzyniak@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>