sdm:  Add support to query Smart Panel attribute

Add support to query Smart Panel attribute of given Display Config,
with the Display Config HIDL API call from SurfaceFlinger to HWC.
SF requires this attribute to populate the list of allowed Refresh
Rate configs to switch Refresh rate among the published Command and
Video mode display configs.

CRs-Fixed: 2535403
Change-Id: I09609ce9aa1987047f9cbe1c3db6392508c59967
7 files changed