At present the set/get user powersave state to MLME and send
command STA powersave mode to firmware operations are not
protected by lock.
Supplicant thread and hdd_ipv4_notifier_work_queue may have
race condition to access the user powersave flag. In that
case the STA powersave state may out of sync.
Fix by acquire sme lock to protect the powersave state set
sequence.
Change-Id: I76d848ea191f2319d015e0d70efad28f56a57d27
CRs-Fixed: 3342696
17751d0800