[PATCH v3] wireless-regdb: Update regulatory rules for Sri Lanka (LK)

[Ping-Ke Shih]

Mohamed Aashif <maashif011 at gmail.com> wrote：
>
> Update Sri Lanka regulatory domain based on the RTTE Type Approval
> Rules 2020 from the Telecommunications Regulatory Commission of
> Sri Lanka (TRC).
>
> Source: https://www.trc.gov.lk/content/files/licensing/RTTE_GAZETTE-English.pdf
>
> Key changes:
> - Change DFS region from FCC to ETSI (document references ETSI
>   standards EN 300 328 and EN 301 893 as the applicable radio
>   interface standards)
> - 2.4 GHz: expand to 2400-2483.5 MHz at 23 dBm
> - 5150-5250 MHz: 23 dBm
> - 5250-5350 MHz: 20 dBm with DFS (no TPC, 3 dB reduction per EN 301 893)
> - 5470-5725 MHz: 27 dBm with DFS (no TPC, per EN 301 893)
> - 5725-5875 MHz: 24 dBm with DFS (per ETSI EN 302 502)
>
> Note: The TRC gazette conflicts internally by allowing 30 dBm for
> 5725-5875 MHz while citing EN 301 893 (which doesn't cover this band).
> Lacking TRC clarification, we conservatively default to the ETSI
> EN 302 502 limits (24 dBm).
>
> Signed-off-by: Mohamed Aashif <maashif011 at gmail.com>

Reviewed-by: Ping-Ke Shih <pkshih at realtek.com>