[SYCL-PTX] Fix license header

Signed-off-by: Victor Lomuller <[email protected]>

Author: Naghasan

libclc/generic/libspirv/integer/upsample.cl

@@ -1,3 +1,11 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
 #include <clc/clc.h>
 #include <core/clc_core.h>