wifi: ath12k: modify regulatory support for single wiphy architecture

wifi: ath12k: modify regulatory support for single wiphy architecture

With all the radios being combined and registered as a single
mac80211 hw/wiphy, separate regd built from firmware rules need
not be updated to cfg80211. Rather we can pick one of the regd
built from the rules to update to cfg80211 for the whole
registered device. We prefer 6 GHz pdev based rules since it has
the rules for all bands. If the hw doesn't support 6 GHz, then update
rules from one of the pdevs.

Also, when regulatory notification is received, update to all the
underlying radios/ar so that it becomes aware of the change and as
well us it updates its local regd with the new country rules. Later
pick the appropriate pdev's regd(6 GHz if available) and apply to
cfg80211.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Sriram R <quic_srirrama@quicinc.com>
Signed-off-by: Rameshkumar Sundaram <quic_ramess@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240405194519.1337906-10-quic_ramess@quicinc.com