qcacmn: Add WMI for estimated airtime calculation

Add support for sending WMI command to firmware
to measure estimated airtime that a new client
will get and populate the result that firmware
returns in the ESP IE.

Change-Id: Ic5fcb11100ecd0597ba02dfa5512e2f4ff3558c9
CRs-Fixed: 2261469
5 files changed