Move tools to revision 22.

Also makes them depend on platform-tools 16 officially.

Change-Id: Iaaeb4ea5d5e04baeef4cb088bce35df4ac42e212
diff --git a/files/tools_source.properties b/files/tools_source.properties
index c62f80d..3deca7a 100644
--- a/files/tools_source.properties
+++ b/files/tools_source.properties
@@ -1,3 +1,3 @@
 Pkg.UserSrc=false
-Pkg.Revision=21
-Platform.MinPlatformToolsRev=15 rc9
+Pkg.Revision=22
+Platform.MinPlatformToolsRev=16