Fix "Factory Reset" fails to reset the device

when device didn't support PersistentDataBlockManager, Settings will
crash at get PersistentDataBlock service.
So we need to check if device support PersistentDataBlockManager
before call getService.

Fixes: 196634851
Test: manual verify on aosp build.
Change-Id: I5afba5df8c4831499478490b442c0fcf367d23ae
1 file changed