Bluetooth: Update SCAN MODE state based on the NVRAM 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 NVRAM. Otherwise,
inquiry scan and page scan are disabled on the local Bluetooth adapter
while turning ON.

CRs-Fixed: 538749
Change-Id: I48af6e3d0d6bc4e8f9c1de139eb74cbb94b8364f
(cherry picked from commit 30628a6284a19b994c3dac31f57d4e3cfe899847)
(cherry picked from commit 12a0224172c7196d6f3b1b897af915261d1d0f39)
(cherry picked from commit b4873f66e7866854a0df54de1880ac62ff61a26d)