Development shortcuts to SwitchPreference for consistency
Settings: Fix no preferred APN

Add preferred APN if found no match.

CRs-Fixed: 748830

Change-Id: Ibecf88a3e6236de13a0a4291438a6e62159a05e0
packages: settings: CryptKeeper: Disable FDE if PFE activated

Don't allow Full-Disk-Encryption (FDE) after Per-File-Encryption (PFE)

Change-Id: I5ed46d4362f6536a6cf526aa5bf4bac4610c47b6