ARM: dts: msm: add dummy clock controllers for sdm670

Add dummy clock controllers for GCC, VIDEO, CAMERA, GPU
and DISPLAY which clients could use.
Also enable the required GDSCs for sdm670.

Change-Id: I49abc8492b6d57244e0f77fdcc6095e70dd4547e
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>