ath10k: implement sta_rc_update()

This should fix possible connectivity issues upon
changes of channel width, number of streams or
SMPS on connected stations.

An example trigger would be an action frame with
operation mode change notification.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>