msm: vidc: Change minimum frame qp to 0

Frame QP value 0 is supported by firmware and hardware.
Driver should accept this value from userspace and pass
through.

CRs-Fixed: 2213967
Change-Id: Idf8dd773aab245f71f64f4639de55d5f9fb71b63
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>