intel-mediasdk: backport upstream patch for license clarification

This upstream backport is purely for license clarification, no code
changes. Like the intel-media-driver backport, I have no intention
to push this to meta-intel, but instead wait until they update their
recipe version and we bump the used layer revision.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

meta-oniro-core/recipes-multimedia/mediasdk/intel-mediasdk_%.bbappend

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: MIT
+
+FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
+
+SRC_URI += "file://removed-proprietary-mentions-from-file-headers.patch"