In case of latest firmware, there can be multiple pdev stats events
received and last_bit is set in the pdev stats to indicate this
is a last pdev stats event to be sent from the firmware to host.
In case of older firmware the last bit will not be set and host waits
for the peer stats event to be the last event, generally for pdev
specific stats request the peer stats will not be sent resulting in
the timeout for the pdev specific stats.
So, if the last_bit in the stats is not present return true when
queried for last event.
Change-Id: I264428edba01285fdab4c109a9051b350063d74f
CRs-Fixed: 2509093
9447e47cbb