[SYCL] exclude cuda from free function tests

Author: dklochkov-emb

sycl/test-e2e/Experimental/free_functions/namespace.cpp

@@ -2,6 +2,9 @@
 // RUN: %{build} -o %t.out
 // RUN: %{run} %t.out
 
+// The name mangling for free function kernels currently does not work with PTX.
+// UNSUPPORTED: cuda
+
 #include <sycl/detail/core.hpp>
 #include <sycl/ext/oneapi/free_function_queries.hpp>
 #include <sycl/usm.hpp>