[Bug 289202] Missing CN regulatory domain and 11ac/DFS support in regdomain.xml

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289202

            Bug ID: 289202
           Summary: Missing CN regulatory domain and 11ac/DFS support in
                    regdomain.xml
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: wireless@FreeBSD.org
          Reporter: yklaxds@gmail.com

Description:
The current lib/lib80211/regdomain.xml is missing critical regulatory domain
entries and modern Wi-Fi standard support:

No CN (China) regulatory domain defined. This makes it impossible to configure
devices correctly under Chinese regulatory requirements.

Lack of 802.11ac (Wi-Fi 5) support. Most regional definitions only include
11a/b/g/n, but not 11ac.

Incomplete DFS support. Even for FCC/3/4 domains, DFS bands are defined only
for legacy 11a/n, but not for 11ac.

This makes the regulatory database outdated and insufficient for current Wi-Fi
usage.

Suggested fix:

Add a new CN regulatory domain entry covering the appropriate 2.4GHz and 5GHz
frequency bands, including DFS channels.

Extend existing regulatory domains (FCC, FCC3, FCC4, ETSI, etc.) with 11ac
support, both DFS and non-DFS channels.

See also the Linux wireless-regdb as reference:
https://wireless.docs.kernel.org/en/latest/en/developers/regulatory/wireless-regdb.html
.

Impact:
Without these updates, FreeBSD users cannot properly use modern Wi-Fi 5 (11ac)
in many regions, including China. This limits performance, feature parity, and
compliance.

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