[SYCL][E2E] Change XFAIL to UNSUPPORTED in USM/fill_any_size

The failure is sporadic, so change to UNSUPPORTED to avoid
XPASS reports while the underlying issue is not yet fixed.

Author: rafbiels

sycl/test-e2e/USM/fill_any_size.cpp

@@ -1,7 +1,7 @@
 // RUN: %{build} -o %t1.out
 // RUN: %{run} %t1.out
-// XFAIL: (opencl && cpu)
-// XFAIL-TRACKER: https://github.com/oneapi-src/unified-runtime/issues/2440
+// UNSUPPORTED: (opencl && cpu)
+// UNSUPPORTED-TRACKER: https://github.com/oneapi-src/unified-runtime/issues/2440
 
 /**
  * Test of the queue::fill interface with a range of pattern sizes and values.