wifi: mac80211: Set RTS threshold on per-radio basis

wifi: mac80211: Set RTS threshold on per-radio basis

Add support to get the radio for which RTS threshold needs to be changed
from userspace. Pass on this radio index to underlying drivers as an
additional argument.

A value of -1 indicates radio index is not mentioned and that the
configuration applies to all radio(s) of the wiphy.

Signed-off-by: Roopni Devanathan <quic_rdevanat@quicinc.com>
Link: https://patch.msgid.link/20250615082312.619639-5-quic_rdevanat@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>