msm: vidc: Simplify DCVS algorithm

Unify Encoder and Decoder DCVS by removing complex buffer
tracking logic. DCVS is based on simple logic now.

    - More YUV buffers with Venus --> Venus is Late -->
          Increase Venus clock.
    - Less YUV buffers with Venus --> Venus is not late -->
          Decrease Venus clock.

CRs-Fixed: 2012520
Change-Id: I47870747dd73e20e1be1fd156ed8ae89ca4b824a
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>