msm: vidc: Update limits of session specific ctrls only

Updates limits of encode specific ctrls only during an
Encode session. During a Decode session all these function
calls are unnecessary.

CRs-Fixed: 2036012
Change-Id: If126fd24319cc497e3d102d5b0a7348bf985df70
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>