IMS Call End Reason Info Code Additions

Adding IMS reason info codes for MO end
use cases:
1. Call rejected/ended due to low battery.
2. Call rejected due to blacklisted call
   ID.

Change-Id: I4e527a643f4a7ebf1ba26e90e4099a66cb5c0e43
CRs-Fixed: 552732
Add constants in voLteServiceState for IMS registration

These constants will be used in the notification of
volte service state when IMS registered/deregistered.

CRs-Fixed: 752266

Change-Id: If6ec8a58ff0270d11fdf95f69ca9da39fdb9a954
IMS-VT: Modification of data usage aidl

Change data usage aidl interface to take parameter type long
instead of int

CRs-Fixed: 747694

Change-Id: I7cda2a689edb86d025dfe8efc8f573918c4bd6bc