Improve video calling setting visiblity behavior.

+ Use ImsManager helpers to determine whether the Enhanced 4G LTE
setting has been set, and whether the device is Enhanced 4G LTE
capable.
+ Update logic in CallFeaturesSetting for visibility of the setting.
If device is capable, but the setting is off, show a dialog with
a button which will send them to Network settings.
- Remove helper in ImsUtil which is no longer needed.

Bug: 16014284
Change-Id: If2c89bb59d1ef7456e5adc2ebc1aea1488947ee7
4 files changed