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

This reverts commit 4abc766f35314bb799d66e62a794df0702fc0dbe.

This commit caused issues with bluetooth on incoming calls.

Fixes:https://jira.cyanogenmod.org/browse/CYAN-5935
Change-Id: Ie8b402172afe43d77d2c163ad6faa3a7b148c4d2