msm: vidc: Update enc work mode and route selection

Work_Route is 1 for VP8 or Slice Mode is Max Bytes.
Work_Mode is 1 for VP8 usecases with resolution UHD and under.
Enable Low Latency when slice mode is Max Bytes.

CRs-Fixed: 2232041 2243429
Change-Id: Ia191ed601d7aed405594bee4659aaac1efb6a4e0
Signed-off-by: Vaibhav Deshu Venkatesh <vdeshuve@codeaurora.org>
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>