video: msm: wfd: Explicitly disable b-frames

Previously, the wfd capture driver was disabling b-frames when the V4L2
client set the intra-period control.  However, we cannot always expect
the client to do so.  Instead set it when client sets the profile.

Change-Id: I9985a74341a149c47d3e7904aa57ce6778f03dde
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>