AppOps: Don't apply OP_ALARM_WAKEUP to system components

System can freely invoke and manage alarms. Preventing it from doing
so interferes with remote components like the backupmanager (backing up alarms)
due to the mismatched uids between the invoking app and the running
service that takes the action.

Change-Id: I079df8d2522642d6d9194781207df7dd67b715b2
audio: Volume can't adjust during HFP call when screen is off.

PhoneWindowManager don't pass the key to the application when screen is
off. In handleVolumeKey(), the STREAM_VOICE_CALL volume was set, so the
STREAM_BLUETOOTH_SCO volume can't be adjusted.
Add a judgement to choose the correct stream to adjust when screen is off.

CRs-Fixed: 649548

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

Change-Id: I1ab06617d59b9bf2eabed9ed8b6892bc20db75b9

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java