msm: vidc: Remove inversion of video priority ctrl value

Priority control value set by client match the values expected by
firmware. Realtime Enable=1 for both, hence inversion is not
required.

CRs-Fixed: 2225514
Change-Id: I24aff5ea62af4339919655ff6417d1443b232764
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>