MFC r256718, r257410 and r257411: - Fix RF registers for RT3070. - Initialize BBP68 to improve RX sensitivity. - Add RT2860_BCN_OFFSET1 and RT2860_MAX_LEN_CFG register initialization to match with the vendor driver. While here, remove unused RT2860_DEF_MAC definition.
MFC r256718, r257410 and r257411:
- Fix RF registers for RT3070.
- Initialize BBP68 to improve RX sensitivity.
- Add RT2860_BCN_OFFSET1 and RT2860_MAX_LEN_CFG register initialization to
match with the vendor driver. While here, remove unused RT2860_DEF_MAC
definition.

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