msm: vidc: Use the future w/h for calculating DCVS load if in reconfig

If we're in the middle of a reconfig and *_dcvs_supported() is called, it
return false.  As a result, we end up under-allocating buffers during
the reconfig event which causes DCVS to scale poorly post-reconfig.

So, when we query to see if the session is supported by DCVS, consider
the new W/H if we're in middle of a reconfig.

Change-Id: I6dd1c94f4a5c7b240027c0efb56694b3f555592e
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>