wifi: mac80211: set cur_max_bandwidth to maximum

wifi: mac80211: set cur_max_bandwidth to maximum

Instead of calculating the individual maximum for each
station from its capabilities, just unconditionally set
cur_max_bandwidth to IEEE80211_STA_RX_BW_MAX. This still
works because cur_max_bandwidth is only used together
with the capabilities of the station anyway, and then
adjusted by HT channel width notification or VHT opmode
notification action frames.

Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260415144514.43cdb11b5c7e.I99a7ea2ab10b6fffb68a401a26b98d546e428c11@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>