More audio use case enhacements
    
- Use TW's "Call Main Mic" for "Speaker DMIC Endfire".
  - Resolves speakerphone echo by using only the main (bottom) mic.

- Clone "Handset" to "Line", as audio-caf uses "Line" by default now.
  - Also matches TW's "Main Mic".
Merge "More audio use case enhacements      - Use TW's "Call Main Mic" for "Speaker DMIC Endfire".   - Resolves speakerphone echo by using only the main (bottom) mic." into cm-10.1
Merge pull request #2 from CyanogenMod/cm-10.1

Cm 10.1