msm: vidc: fix high framerate video usecase issue

High framerate (480fps) video usecase needs more
clock frequency for video hardware and hence increase
clock frequency by considering firmware clock cycles
as well.

Change-Id: I3dcb9c4fadd5f91d9874a3e963c30e7eb74da7ab
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>