soc: qcom: ddr: add driver support to help track ddr health

Add driver support to dynamically allocate memory and pass pointer to RPM
to track DDR health.

Change-Id: Idd5c8b679d5b0942183e6a6ba668b3635731d9d4
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>