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

This reverts commit 54ac716c454fea8d3a32e7ec1f8717f5238ab956.

Change-Id: I098d36f5f77780bd214312be8df5123d6d2975e3
Revert "msm: vidc: Amend calculation of buffer sizes in VENUS_BUFFER_SIZE"

This reverts commit 86092211fb76e5174dc004ffa03df9bdab06eca8.

Change-Id: I4bbe720be816672e7480e1fa0f13f51a97d3506b