wil6210: do not start regular scan on stopped p2p device

The driver should not allow starting any type of scan on a stopped
P2P device. Current implementation only checked social scan.

Signed-off-by: Lior David <qca_liord@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>