wifi: cfg80211: skip regulatory for punctured subchannels

The kernel performs several regulatory checks for AP mode in
nl80211/cfg80211. These checks include radar detection,
verification of whether the sub-channel is disabled, and
an examination to determine if the channel is a DFS channel
(both DFS usable and DFS available). These checks are
performed across a frequency range, examining each sub-channel.

However, these checks are also performed on subchannels that
have been punctured which should not be examined as they are
not in use.

This leads to the issue where the AP stops because one of
the 20 MHz sub-channels is disabled or radar detected on
the channel, even when the sub-channel is punctured.

To address this issue, add a condition check wherever
regulatory checks exist for AP mode in nl80211/cfg80211.
This check identifies punctured channels and, upon finding
them, skips the regulatory checks for those channels.

Co-developed-by: Manaswini Paluri <[email protected]>
Signed-off-by: Manaswini Paluri <[email protected]>
Signed-off-by: Kavita Kavita <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Johannes Berg <[email protected]>

Author: Kavita Kavita