Add BR_902, Brazil 902MHz-907.5MHz #7399
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As reported by @barbabarros , the Brazilian government has specific support for LoRA[1] across multiple frequencies[2][3].
We currently support Brazil through the ANZ/AU915 band. However, Brazil also has another frequency available for use:
902 - 907.5 MHz , 1W power limit, no duty cycle restrictions
[1] https://sistemas.anatel.gov.br/anexar-api/publico/anexos/download/a028ab5cc4e3f97442830bba0c8bd1dd [2]
https://informacoes.anatel.gov.br/legislacao/resolucoes/2025/2001-resolucao-772 [3] https://informacoes.anatel.gov.br/legislacao/atos-de-certificacao-de-produtos/2017/1139-ato-14448#item10
Protobuf patch: meshtastic/protobufs#737
Fixes #3741