msm: vidc: Consider operating rate in load calculations

Include operating rate in fps (frames per second) which
will be used to derive load and bandwidth calculations
to resolve HFR (high frame rate) usecases.

Change-Id: I1e4b15dc2e73ef88c7ba76a9c28483d1f52dd388
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>