In the driver, if CLUB_LL_STATS_AND_GET_STATION feature is
enabled, host requests Link Layer stats and station stats
from firmware periodically using a single WMI command.
Host then sends LL_STATS to userspace and caches station stats
in the adapter. Whenever userspace queries station stats, based
on the sta_stats_cached_timestamp, host returns cached stats
from adapter instead of sending a new WMI request.
The current issue, as part of station stats firmware also sends
connection_tx_power stats, which aren't cached into the adapter.
So, whenever userspace queries get_tx_power via nl commands,
host sends a WMI request to firmware for tx_power leading to
platform wakeups and power impacts.
To resolve this issue, cache the tx_power sent by firmware into
the adapter during station stats and return the cached value to
the user space.
Change-Id: Iaefc5629872431cbc6c24090b1edb6cebdad995a
CRs-Fixed: 3439323
3336cc1673