Host driver rate limits successive get_txpower
calls within 3 seconds, and sends cached stats
from the hdd_stats. However, max_tx_power is
not updated in the hdd_stats. Therefore,
the cached tx power is always 0 dBm.
Also, the hdd_stats would be only updated when
CP stats are received from the firmware for
get_station/dump_station calls. get_station is not
periodically queried for SAP interface from the
framework. Therefore, tx power for SAP interface will
always be 0 even if hdd_stats gets updated.
To fix this, instead of hdd_stats, return the
max tx power from the pdev stats cached on the pdev.
Change-Id: I0c8d8baab790c7344bd8913158f8eda63736474e
CRs-Fixed: 3230649
46a85a4bfc