soc: qcom: Service notification driver for remote services

Add a library for a kernel client to register and be notified of
any state changes regarding a local or remote service which runs
on a remote processor on the SoC.

Change-Id: Idd56140e11f4fdc48fd999a1e808f3263024f34d
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>