ARM: dts: msm: Enable DFPS support for SM8150 2K panel

Add the required properties to enable DFPS feature for
the 2K display panel used by SM8150.

CRs-Fixed: 2256126
Change-Id: I3a3feb1b7767c30223e5fd2176437401266f0205
Signed-off-by: Ray Zhang <rayz@codeaurora.org>