msm: ADSPRPC: Log release error only when init is successful

Log fastrpc device release error only when fastrpc init process
is completely successful to avoid excessive logging in case of
DSP is up or init process is continuosly failing.Also invoke
kill dsp process, only when subsystem is up

Change-Id: I5d7c85cb96baf6508622512d0a0ace0c5de54e21
Acked-by: Himateja Reddy <hmreddy@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>