msm: adsprpc: Race conditions when handling the ADSP SSR

Removed marking the static process is closed
in ADSP SSR call back. Any way, this is
handled during the PDR callback.

Change-Id: Idcc358a972546f93cb8e7cd5e28d446e7fd632e1
Acked-by: Nishant Chaubey <chaubey@qti.qualcomm.com>
Signed-off-by: Jeya R <jeyr@codeaurora.org>