Fix issue 5440852: Youtube volume is too small ...

When no DRC is applied by the platform when playing
over the device speaker, faint audio signals are not boosted and
barely audible until the media volume is raised to about one fourth
of the range.

Compensate this by applying a different volume curve for music stream
when the speaker is selected.

Change-Id: I03f316fb28150eda50b05dfa12310701e2674648
2 files changed