dmaengine: idxd: Change license on idxd.h to LGPL

This file was given GPL-2.0 license. But LGPL-2.1 makes more sense
as it needs to be used by libraries outside of the kernel source tree.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/uapi/linux/idxd.h b/include/uapi/linux/idxd.h
index e33997b..edc346a 100644
--- a/include/uapi/linux/idxd.h
+++ b/include/uapi/linux/idxd.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* SPDX-License-Identifier: LGPL-2.1 WITH Linux-syscall-note */
 /* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
 #ifndef _USR_IDXD_H_
 #define _USR_IDXD_H_