Reuse channel for same sample if the channel completed
current playback and is not reallocated to another sample,
i.e. not stolen by other sample.
authored-by: Ashish Jain <ashishj@codeaurora.org>
Change-Id: Ibe7ee318c7dc11f3c4fd3a2f57d861318b10973b
Signed-off-by: Glenn Kasten <gkasten@google.com>