Revert "mm-video-legacy: vidc: venc: revert of temporary entropysel changes"

* The entropysel changes are upstream in CAF, but not yet integrated into Google's repos.
* Revert the change here until the kernels of our Nexus devices are updated properly.

This reverts commit 73ab1481293217776704dc96f6b4e0c9a0fb7edf.