ASoC: msm: qdsp6v2: add support to enable TTY during VoLTE call

Enable of TTY during VoLTE call is not supported. Add support to
enable TTY during VoLTE call.

CRs-Fixed: 697463
Change-Id: Ie104eddd7b404f278a0d4def770a3f6fffef901c
Signed-off-by: Venkata Narendra Kumar Gutta <vgutta@codeaurora.org>
Merge "ASoC: msm: qdsp6v2: add support to enable TTY during VoLTE call"