soc: qcom: Add new SMP2P sleepstate driver

SMSM has been deprecated and will be removed. The remaining use case
is for APSS suspend state notification between APSS and DSPS.

Add support for SMP2P suspend state notification between APSS and DSPS
to replace existing SMSM solution.

Change-Id: I868b29366d10098af5db71d53a572061d9d233ba
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>