soc: qcom: glink_ssr: Add API to wait for SSR completion

Add API and implementation to wait for the response from the remote
subsystem that have been notified about a reset of another subsystem.

Change-Id: I5b9abf4528969b97ba1e615c39f4f8653d3483ea
Signed-off-by: Steven Cahail <scahail@codeaurora.org>
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>