iw: bitrate: support EHT rate/gi/ltf Support eht-mcs-*/eht-gi-*/eht-ltf-* fields when iw set bitrates. Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com> Link: https://patch.msgid.link/20250922071017.11954-4-kevin_yang@realtek.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>