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-perl/README b/meta-openembedded/meta-perl/README
index 3c787f4..67f2910 100644
--- a/meta-openembedded/meta-perl/README
+++ b/meta-openembedded/meta-perl/README
@@ -52,7 +52,7 @@
 This layer depends on:
 
   URI: git://git.openembedded.org/openembedded-core
-  branch: thud
+  branch: master
   revision: HEAD
   prio: default
 
@@ -75,12 +75,14 @@
 -----------
 
 Send patches / pull requests to openembedded-devel@lists.openembedded.org with
-'[meta-perl][thud]' in the subject.
+'[meta-perl]' 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-perl][thud][PATCH'
+'git send-email -M -1 --to openembedded-devel@lists.openembedded.org --subject-prefix=meta-perl][PATCH'
 
-Thud maintainers: Armin kuster <akuster808@gmail.com>
+Layer maintainers:
+    Hongxu Jia <hongxu.jia@windriver.com>
+    Tim "moto-timo" Orling <ticotimo@gmail.com>
 
 License
 -------