msm: vidc: Fix setting RC mode control

Rate control mode should be set only when rate-control is enabled.
Introduces rc_type to cache rate-control mode in driver and
moves control dependency resolution to venc set control.

Change-Id: I4bff67ca31684c4f87cafc30bf0f472595da468e
Signed-off-by: Amit Shekhar <ashekhar@codeaurora.org>