soc: qcom: subsys_notif: Add support for auth_and_reset notifications

The pil_boot() function performs several steps before the subsystem is
brought out of reset.
Some clients may require a special handling just before the subsystem
is brought out of reset.
Allow a client to register a callback for notification just before the
subsystem is brought out of reset.

Change-Id: I95a3b4a65040070345d1b42c2065f31455e70e24
Signed-off-by: Amir Samuelov <amirs@codeaurora.org>