and antenna diversity:
Check the hardware capabilities---transmit power control (TPC),
antenna diversity---before setting up the sysctls that control
those capabilities. Previously, the TPC and ant. diversity sysctls
were not setup because ath_sysctlattach was called before sc_hastpc
and sc_hasdiversity were initialized, so users could not view/control
antenna diversity or TPC settings, even on hardware with those
capabilities.
Obey the user's transmit-antenna selection even when sending IBSS
beacons on hardware with VEOL capability; for all other hardware/modes,
only switch transmit antennas after every four beacons if the user
has not selected a transmit antenna---i.e., they chose antenna 1
or 2 instead of 0 ("auto").
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