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: I4406ad7559ef5222e8d78b545dfde0168c513eae
Acked-by: Tadakamalla Krishnaiah <ktadakam@qti.qualcomm.com>
Signed-off-by: Mohammed Nayeem Ur Rahman <mohara@codeaurora.org>