Various IMS changes. (1/2)

1. Passing through videoState to acceptCall in ImsPhone and below.
2. Fixing issue in GSMPhone where IMS calls are always dialed as
audio.
3. Adding setter on android.internal.telephony.Connection for
call video provider and passing through to telecomm.Connection

Bug: 15893156
Change-Id: Id7a53807873add408d59452e1b79cfa748f972e8