some fixes to framework

Change-Id: I2fc93873692c0060a0a9ba7cf27a75e890afa548
Settings provider: def dock audio media enabled

Change-Id: I52e70fdab96edd9d71dea62d90c85474d37f08b0
lockscreen background customization

Change-Id: Id99fae0d15fcf9cd293e08273eff50dd73834d01