wil6210: support AOA in FTM session

Add support for running AOA measurement as part of an
FTM session.
In order to simplify the implementation both in the driver
and FW, AOA measurement is reported using the same vendor
event and not using QCA_WLAN_VENDOR_ATTR_FTM_PEER_RES_AOA_MEAS.
This way we can also report the antenna array mask which was
missing from the vendor commands API for AOA inside FTM session.

Change-Id: I3962487b2e6fd8e56e6e3953c86fd95abe6a9aa0
Signed-off-by: Lior David <liord@codeaurora.org>