ARM: dts: Modify ocmem related bus vectors for GPU

Modify the ocmem end point for GPU. This is needed since GPU and video
cores have separate direct accesses to ocmem so its easier to aggregate
for requests from each core. Clock entry is added for ocmem so that
both masters can access ocmem.

Change-Id: Ie84658163548d88e0d26b3da7c61c6c56d2cf368
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>