nuplayer: restart source for 24 bit WAV playback

Generic source start was delayed if the playback
was 24 bit WAV content. This causes issue
with state of the playback leading to
issues with seek, progress bar among others.
Fix this by re-starting playback when
the playback configuration changes.

Change-Id: I9802e50fa6b0360fbfe68a8169f651cab4bd1351
CRs-Fixed: 802202