Add license attribution for vk.xml

Same license as the existing OpenGL stuff.

Change-Id: I6d0a77a7213f496971b5c3a8676dedb8e4377ceb
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

src/gui/vulkan/KHRONOS_LICENSE.txt

@@ -0,0 +1,20 @@
+Copyright (c) 2015-2017 The Khronos Group Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and/or associated documentation files (the
+"Materials"), to deal in the Materials without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Materials, and to
+permit persons to whom the Materials are furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Materials.
+
+THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

src/gui/vulkan/qt_attribution.json

@@ -0,0 +1,17 @@
+[
+    {
+        "Id": "vulkan-xml-spec",
+        "Name": "Vulkan API Registry",
+        "QDocModule": "qtgui",
+        "Description": "Vulkan XML API Registry.",
+        "QtUsage": "Used to dynamically generate the sources for the QVulkan(Device)Functions classes.",
+        "Path": "vk.xml",
+
+        "Homepage": "https://www.khronos.org/",
+        "Version": "1.0.39",
+        "License": "MIT License",
+        "LicenseId": "MIT",
+        "LicenseFile": "KHRONOS_LICENSE.txt",
+        "Copyright": "Copyright (c) 2015-2017 The Khronos Group Inc."
+    }
+]