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-multimedia/README b/meta-openembedded/meta-multimedia/README
index 050392d..20f4fb8 100644
--- a/meta-openembedded/meta-multimedia/README
+++ b/meta-openembedded/meta-multimedia/README
@@ -1,19 +1,19 @@
 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
 layers: meta-oe
-branch: thud
+branch: master
 revision: HEAD
 
-Send pull requests to openembedded-devel@lists.openembedded.org with '[meta-multimedia][thud]' in the subject'
+Send pull requests to openembedded-devel@lists.openembedded.org with '[meta-multimedia]' in the subject'
 
 When sending single patches, please use something like:
-'git send-email -M -1 --to openembedded-devel@lists.openembedded.org --subject-prefix=meta-multimedia][thud][PATCH
+'git send-email -M -1 --to openembedded-devel@lists.openembedded.org --subject-prefix=meta-multimedia][PATCH
 
 You are encouraged to fork the mirror on github https://github.com/openembedded/meta-oe/ to share your patches, this is preferred for patch sets consisting of more than one patch. Other services like gitorious, repo.or.cz or self hosted setups are of course accepted as well, 'git fetch <remote>' works the same on all of them. We recommend github because it is free, easy to use, has been proven to be reliable and has a really good web GUI.
 
-Thud maintainer: Armin Kuster <akuster808@gmail.com>
+Layer maintainer: Andreas Müller <schnitzeltony@googlemail.com>