msm: vidc: Set proper DCVS thresholds for DCI@24 encode

Since the load for UHD@30 is greater than the load for DCI@24, the
thresholds weren't being set properly.  This resulted in the venus clock
rate being far too low, leading to frame drops.

Change-Id: I43208907b4777333c3a987c78890a39519a82462
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>