(ImsMedia) Changed Dtmf APIs

  - startDtmf(char dtmfDigit, int volume, int duration)
    updated to sendDtmf(char dtmfDigit, int duration)
  - stopDtmf() removed

Bug: 228134488
Test: build (mm)
Change-Id: I77224e71675b9d45f76bca36db64783a6ce4bf82
2 files changed