wifi: mac80211: AP: handle DBE for clients

wifi: mac80211: AP: handle DBE for clients

In AP mode, track the BSS non-DBE bandwidth and apply
that to all non-DBE clients, then track OMP updates
from the clients and enable/disable DBE accordingly.

For now don't send a response, clients need to have a
timer anyway (it's up to the driver to set the right
timeout in UHR capabilities.)

Link: https://patch.msgid.link/20260529102644.be84f2b055cc.I4d2c067dfe54c47621d5a872ca07a0e754d6c20f@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>