qcacld-3.0: Cleanup handle & rate_flags from struct wma_txrx_node

As a part of vdev convergence, struct wma_tx_rx_node's handle &
rate_flags members are no more unused. These values are derived
from mlme_obj.

So no more used members of struct wma_txrx_node are cleaned.

Change-Id: I0b536c50717edc293ab27e5d520eb490266ba2ce
CRs-Fixed: 2534222
8 files changed