[SYCL] Add bf16 aspect

SYCL/Basic/aspects.cpp

@@ -54,6 +54,9 @@ int main() {
     if (plt.has(aspect::fp64)) {
       std::cout << "  fp64" << std::endl;
     }
+    if (plt.has(aspect::bf16))  {
+      std::cout << " bf16" << std::endl;
+    }
     if (plt.has(aspect::int64_base_atomics)) {
       std::cout << "  base atomic operations" << std::endl;
     }