msm: pil-vpu: Move clock names to device tree node

Some VPU clocks have been changed between 8084 and 8092 targets.
Pass clock names from device tree to make the driver compatible.

Change-Id: I8666570c483e8970a000793583301d11b7a4c4bb
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>