msm_vidc: update bus bandwidth selection for video driver.

Incorrect bus bandwidth was selected for video encoder or decoder,
resulting in performance being lower than expected. This change picks
the correct value when requesting bus bandwidth.

Change-Id: I76d8bc4e77430337e26aa394e6a3c1d0e5c8b79b
CRs-Fixed: 406619
Signed-off-by: Ashray Kulkarni <ashrayk@codeaurora.org>