Change namespace from OCLRT to NEO

Change-Id: If965c79d70392db26597aea4c2f3b7ae2820fe96
Signed-off-by: Maciej Plewka <maciej.plewka@intel.com>

runtime/os_interface/linux/allocator_helper.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 Intel Corporation
+ * Copyright (C) 2018-2019 Intel Corporation
  *
  * SPDX-License-Identifier: MIT
  *
@@ -8,6 +8,6 @@
 #pragma once
 #include <cstddef>
 
-namespace OCLRT {
+namespace NEO {
 size_t getSizeToMap();
-} // namespace OCLRT
+} // namespace NEO