[hip-tests] Tag multigpu tests with Catch2 tags (#1315)

projects/hip-tests/catch/unit/memory/hipMallocArray.cc

@@ -80,7 +80,7 @@ This testcase verifies the hipMallocArray API in multithreaded
 scenario by launching threads in parallel on multiple GPUs
 and verifies the hipMallocArray API with small and big chunks data
 */
-TEST_CASE("Unit_hipMallocArray_MultiThread") {
+TEST_CASE("Unit_hipMallocArray_MultiThread", "[multigpu]") {
   CHECK_IMAGE_SUPPORT
 
   std::vector<std::thread> threadlist;