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Whether the paused videoState is available is dependent on the carrier's
implementation of the VT spec. The original VT implementation assumed
that this was stored in a system property accessed via InCall; these CLs
move this to a Call/Connection capability which will ultimately support
multisim video capable devices.

- For MCC/MNC 310/410, disable pause of ims video calls.
- For MCC/MNC 311/480, allow pause of ims video calls.
- Default for others is allow pause.

- Modified TelecomAccountRegistry to store flag indicating which accounts
allow pausing of video.  If account doesn't support video, pausing is
inherently not allowed either.
- Modified PstPhoneCapabilities notifier to add listener which calls back
to TelecomAccountRegistry#AccountEntry to notify when the video capability
has changed, triggering the AccountEntry to refresh itself accordingly.


Bug: 16680364
Bug: 19820114
Change-Id: I3840f92270100811161120dffcfe297bef7c4ea2