Revert 3 last commits of frapeti for "in-call volume workaround"

This reverts commit 6f4729bd790ee8178a2fda376446b21f85213675.
This reverts commit 5912ac71fc2f342aebddbc5290186868cb4c6754.
This reverts commit fd591cf609cf316f46dc35cfced0b3c7d84ff3ed.
Ported low-incall volume workaround from cm-10.1 to cm-10.2