keystore: Move wifi keystore HAL service out

Also, removed the mutex added to protect keystore service internals
from synchronous HIDL calls.

Bug: 142969896
Test: Verified connecting to passpoint networks.
Change-Id: Iffb7dc6bbde6d205519ffdafeb0bd53fbc5611b1
Merged-In: Iffb7dc6bbde6d205519ffdafeb0bd53fbc5611b1
5 files changed