msm: vidc: Update VSP cycle count calculation

Update VSP cycle count calculation as per new system
recommendations. Use of Entropy and Work Mode for more
accuracy.

CRs-Fixed: 2502809
Change-Id: I7fcd96c58b583a2a2ff1bc3e918233fbcb7bfa68
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>