misc: Update licenses to Apache 2.0

Change-Id: Id447f4c8c53d33f9192940bdd3ae727b7b738a97
diff --git a/vk.xml b/vk.xml
index 1003460..bddf823 100644
--- a/vk.xml
+++ b/vk.xml
@@ -3,24 +3,17 @@
     <comment>
 Copyright (c) 2015-2016 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:
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
 
-The above copyright notice and this permission notice shall be included
-in all copies or substantial portions of the Materials.
+     http://www.apache.org/licenses/LICENSE-2.0
 
-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.
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
 
 ------------------------------------------------------------------------