msm: vidc: Don't erase buffer flags in EBD

The flags passed in qbuf need to be preserved when dqbuf is called.

CRs-Fixed: 637882
Change-Id: I8afed98dabfefc6694cd12da786480836fc7464e
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
Vidc hack