htt_ctrl_analyzer.py: Filter out unknown message id's
htt_ctrl_analyzer.py: Filter out unknown message id's

Unknown message id's are id's that don't have a corresponding
message enum.

Signed-off-by: Erik Stromdahl <bceaca8caa2900989bb30a1257212196c3d2e7c8@gmail.com>

erstrom/qca-hex-analyzer