Add ext_oneapi_unified_runtime SYCL backend test (intel/llvm-test-suite#1450)

Signed-off-by: Sergey V Maslov <sergey.v.maslov@intel.com>

Author: smaslov-intel

SYCL/Plugin/sycl-ls-unified-runtime.cpp

@@ -0,0 +1,16 @@
+// REQUIRES: level_zero
+//
+// RUN: env ONEAPI_DEVICE_SELECTOR="ext_oneapi_unified_runtime:*" sycl-ls --verbose 2>&1 %GPU_CHECK_PLACEHOLDER
+
+// CHECK: 	Platforms: 1
+// CHECK-NEXT:	Platform [#1]:
+// CHECK-NEXT:      Version  : 1.3
+// CHECK-NEXT:      Name     : Intel(R) oneAPI Unified Runtime over Level-Zero
+
+//==-- sycl-ls-unified-runtime.cpp ----- Test Unified Runtime platform  ----==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//