Bluetooth: Update SCAN MODE state based on the storage value

Change will update the SCAN MODE state while Bluetooth is turning ON based
on the previous SCAN MODE state which is stored in the storage. Otherwise,
inquiry scan and page scan are disabled on the local Bluetooth adapter
while turning ON.

CRs-Fixed: 538749
Change-Id: I48af6e3d0d6bc4e8f9c1de139eb74cbb94b8364f