[SYCL] Temporarily disable flaky Reduction/reduction_nd_N_vars.cpp test (#389)

Author: alexbatashev

SYCL/Reduction/reduction_nd_N_vars.cpp

@@ -3,8 +3,8 @@
 // RUN: %GPU_RUN_PLACEHOLDER %t.out
 // RUN: %ACC_RUN_PLACEHOLDER %t.out
 
-// TODO: The test irregularly reports incorrect results on CPU.
-// UNSUPPORTED: cpu
+// TODO: The test irregularly reports incorrect.
+// UNSUPPORTED: TEMPORARY_DISABLED
 
 // This test checks handling of parallel_for() accepting nd_range and
 // two or more reductions.