Revert "drm/i915/perf: add a parameter to control the size of OA buffer"

Revert "drm/i915/perf: add a parameter to control the size of OA buffer"

Userspace portion is still missing.

This reverts commit cd956bfcd0f58d20485ac0a785415f7d9327a95f.

Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181116135510.13807-1-joonas.lahtinen@linux.intel.com