Revert "arm: dts: Remove ocmem usage by the video driver temporarily on 8084"

OCMEM was temporarily disabled as a workaround to related issues.  As
those issues have been resolved, re-enable it.

CRs-Fixed: 604596
Change-Id: I0552199cd85e12b4789ca6c737583d7e9360cbd4
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>