Pass Drm object to OsContext on Linux

Change-Id: I341925eef9bc892f5c321c668736bb6a3aff38f5
Signed-off-by: Dunajski, Bartosz <bartosz.dunajski@intel.com>

runtime/os_interface/linux/os_context_linux.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#include "runtime/os_interface/os_context.h"
+
+namespace OCLRT {
+class Drm;
+using OsContextLinux = OsContext::OsContextImpl;
+
+class OsContext::OsContextImpl {
+  public:
+    OsContextImpl(Drm &drm);
+
+  protected:
+    Drm &drm;
+};
+} // namespace OCLRT