Audio V4: Move common test code in common folder

The previous patch made the test independent of the HAL version
As a result, move them in the version common folder.

Note that this patch is separated from the previous patch to ease
review.

Bug: 38184704
Test: compile
Change-Id: I98a46eb0b88ea786656200ab613afd2d36ed222d
Signed-off-by: Kevin Rocard <krocard@google.com>