Currently, when disabling the power save mode, driver sends
the TWT teardown command 10 times to the firmware. These 10
commands being received by the firmware within 200 ms.
However, this time doesn't enough time for the scanning
process to complete.
To address this issue, added a delay of 500ms between each
TWT teardown command sent by the driver to allow for the
successful completion of scanning before further commands
are issued.
CRs-Fixed: 3626036
Change-Id: I214e5dc94e94eb48f41436f9e5f1a6b9714f4bc1
e22f9adc77