qcacmn: Fix TWT rx frames capture in packet capture mode

Currently the TWT rx frames are dropped in
tgt_mgmt_txrx_rx_frame_handler considering them as unspecified
packets as action category for TWT is not defined.

Define TWT action category so that the TWT frames will not be
considered as unspecified frames and dropped while processing.

Change-Id: I2d9c01e89029bcbb379a5a9c77a7d101de155d6a
CRs-Fixed: 3087275