reset upstream subtrees to HEAD

Reset the following subtrees on HEAD:
  poky: 8217b477a1(master)
  meta-xilinx: 64aa3d35ae(master)
  meta-openembedded: 0435c9e193(master)
  meta-raspberrypi: 490a4441ac(master)
  meta-security: cb6d1c85ee(master)

Squashed patches:
  meta-phosphor: drop systemd 239 patches
  meta-phosphor: mrw-api: use correct install path

Change-Id: I268e2646d9174ad305630c6bbd3fbc1a6105f43d
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-openembedded/meta-gnome/README b/meta-openembedded/meta-gnome/README
index 84d4f73..2a682e7 100644
--- a/meta-openembedded/meta-gnome/README
+++ b/meta-openembedded/meta-gnome/README
@@ -23,16 +23,16 @@
 This layer depends on:
 
 URI: git://github.com/openembedded/oe-core.git
-branch: thud
+branch: master
 revision: HEAD
 
 URI: git://github.com/openembedded/meta-oe.git
-branch: thud
+branch: master
 revision: HEAD
 
-Send pull requests to openembedded-devel@lists.openembedded.org with '[meta-gnome][thud]' in the subject'
+Send pull requests to openembedded-devel@lists.openembedded.org with '[meta-gnome]' in the subject'
 
 When sending single patches, please using something like:
-'git send-email -M -1 --to openembedded-devel@lists.openembedded.org --subject-prefix=meta-gnome][thud][PATCH'
+'git send-email -M -1 --to openembedded-devel@lists.openembedded.org --subject-prefix=meta-gnome][PATCH'
 
-Thud maintainer: Armin Kuster <akuster808@gmail.com>
+Layer maintainer: Andreas Müller <schnitzeltony@googlemail.com>