Bluetooth: Add trust device feature.

Add set trust feature where the remote device is marked
as a trusted device for subsequent connection.

CRs-fixed: 523135

Change-Id: I9bde4d7dfe07d9d63b58a661ed2413f45501bd7b
Merge branch 'cm-10.2' of git://github.com/CyanogenMod/android_frameworks_base into cm-10.2