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 4f1275a26d49f62a809d3f343b184bc370cdbb59.

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