msm: vidc: Force venus to max if operating rate is INT_MAX

If client sets operating rate as INT_MAX, vote the highest
Venus clock and BW. This will allow operating the video session
at highest possible performance. DCVS & Batching is disabled.

CRs-Fixed: 2502809
Change-Id: I33e952f501a3ba6c1c8588ee319e10a586941d05
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>