ARM: dts: msm: Update clock nodes for sdm670

Modify the gcc, rpmh, video_cc, cam_cc, disp_cc, gfx_cc and
gpu_cc dummy clock nodes to use the real clock controllers
for all clock controller clients.

Change-Id: Ie2d4d0835b40a61018ceb96fbd94452e67c410bb
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>