Revert "performance: improve pool handling"

This reverts commit a3c3b6533a.

Signed-off-by: Michal Mrozek <michal.mrozek@intel.com>

shared/source/helpers/options.h

@@ -7,7 +7,6 @@
 
 #pragma once
 #include <cstdint>
-#include <stddef.h>
 
 namespace NEO {
 enum class CommandStreamReceiverType {
@@ -39,7 +38,4 @@ extern const char *folderAUB;
 // Initial value for HW tag
 // Set to 0 if using HW or simulator, otherwise 0xFFFFFF00, needs to be lower then CompletionStamp::notReady.
 extern uint32_t initialHardwareTag;
-
-// default size of memory pools
-extern size_t defaultPoolSize;
 } // namespace NEO