ASoC: wcd-dsp-mgr: set status before broadcasting post events

During image download, the status is set after post download events
are broadcasted. This could possibly lead to race condition if other
drivers requested to boot the dsp before the status was set. Change
makes sure the wdsp status is set prior to broadcasting post download
events to avoid possible race conditions.

CRs-fixed: 1071949
Change-Id: If3ec6202b4729b24ee839c3a8aa4edf2482d6e59
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>