wifi: mac80211: start and finalize channel switch on link basis

Add changes to start a channel switch as well as finalize it on link basis
in order to support CSA with MLO as well.

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
Link: https://msgid.link/20240130140918.1172387-5-quic_adisi@quicinc.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>