IMS-VT: Disable TTY mode settings when in a video call

- Currently TTY mode is turned off when we are in a call
  and if volte is enabled and tty mode for volte is supported
  "carrier_volte_tty_supported_bool" which is set to true in
  config manager defaults

- Add a check to see if video call is in progress on any phone
  object then disable TTY mode settings
  
Bug: 27106636

Change-Id: Ie15585362f59d71d242d87e41b3c495e6508a85c
1 file changed