soc: qcom: smp2p: Add support for suspend to disk

Add support in smp2p driver for suspend to disk feature.
Get SMEM related items during resume from hibernation.

Change-Id: Ib342d914e8f5ed1cdee610e5d1f64128b080fb91
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>
Signed-off-by: ArunPrakash <app@codeaurora.org>