Cleanup VoicemailContract.
Cleanup VoicemailContract.

Moved constants/methods specific to Voicemails and Status table under
respective classes.

Marked currently used constants as deprecated, which will be deleted
once the apps using it is modified.

Change-Id: I122439c32ac62e9ae83c4c8468f5160a79743335

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base