msm: adsprpc: Allow association with static processes

Allow process on application processor to be associated with a
process on DSP that has been spawned on bootup. This allows for
further RPC calls to be associated with the static process.
Handle SSR, daemon kill and restart scenarios for audio PD.

Change-Id: I68989490ff7750fc44ca5640a3d136c8e7bc28d2
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>