msm: vidc: Updating video llc bw calculation for sm8150

Fixed an issue in video llc bw calculation which was
leading to max llc bw votes.

Change-Id: I5cffa00b196b7769e2dd39560f4b4bc47d4d50b3
CRs-Fixed: 2201248
Signed-off-by: Shivendra Kakrania <shiven@codeaurora.org>