Add offset when rescaling streams with different min indices

Only apply solution for DTMF stream to make sure that it is not muted
when re-aliasing to voice call stream. With ringMyCar flag enabled
this will be automatically solved since we are sending the mute state
to APM

Flag: EXEMPT bugfix
Bug: 399512501
Test: manual
Change-Id: I3f9fb602d17bc6a2a8d4ab744d073745ab0b065a