[SYCL] Disable user defined reductions on CUDA/HIP (#1429)

Test was just added in
#1395
and fails on these platforms

Author: Pavel Chupin

SYCL/UserDefinedReductions/user_defined_reductions.cpp

@@ -1,5 +1,7 @@
 // RUN: %clangxx -fsycl %s -o %t.out
 // RUN: %t.out
+//
+// UNSUPPORTED: cuda || hip
 
 #include <numeric>