Add QCA vendor command for airtime fairness (ATF)

Add QCA vendor command for airtime fairness (ATF)

Define a QCA vendor subcmd QCA_NL80211_VENDOR_SUBCMD_ATF_OFFLOAD_OPS and
attributes for for Airtime Fairness (ATF) offload operations. This
command enables configuration and control of ATF features, which aim to
managing airtime distribution across various entities such as SSIDs,
SSID groups, peers, and access categories.

This interface is intended for use to dynamically manage airtime
distribution based on scheduling policy (if configured) across various
entities such as SSIDs, SSID groups, peers, and access categories.

Signed-off-by: Harish Rachakonda <rachakon@qti.qualcomm.com>