Revert "msm: vidc: Expose extradata size to userspace"

This reverts commit 6620e87e7a94e12803ad95f6a0063c0bb72d8726.
Revert "msm: vidc: Amend calculation of buffer sizes in VENUS_BUFFER_SIZE"

This reverts commit ca2ca4abb2e9f55c6becf3174f382794700a3691.