msm: vidc: Disable DCVS for 720p@240 enc on lagoon

1. Camera creates an internal batch based on hfr/preview_fps
   i.e 8 for 240fps usecases. Hence camera sends 8 ETB's in
   single shot and then waits for 25-30ms, which causes the
   side effect at FW. Either FW is always waiting for input
   or loaded with input buffers.
2. Being a HFR use case (<480), DCVS max_threshold for this
   usecase (i.e max number of input buffers that can held by
   encoder) is 8, due to which 20% of the usecase runs in
   DCVS high corner. For this use case, DCVS_high is turbo.
   Since DDR runs at Nominal and there would not be much
   savings when clocks runs at SVS_L1, disabling DCVS for
   this usecase on lagoon.

Change-Id: Ifcc7da11cf4347655dbf3e39e41b4bceb5854167
Signed-off-by: Priyanka Gujjula <pgujjula@codeaurora.org>