Correct declaration of DrmResidencyHandlerTest class

Change-Id: I53c527954c44dcd7061975064365a1052d4fb5d1
Signed-off-by: Zbigniew Zdanowicz <zbigniew.zdanowicz@intel.com>

unit_tests/os_interface/linux/drm_residency_handler_tests.cpp

@@ -14,7 +14,7 @@
 using namespace NEO;
 
 struct DrmResidencyHandlerTest : public ::testing::Test {
-    void SetUp() {
+    void SetUp() override {
         drmResidencyHandler = std::make_unique<DrmResidencyHandler>();
     }