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/poky/README.OE-Core b/poky/README.OE-Core
new file mode 100644
index 0000000..521916c
--- /dev/null
+++ b/poky/README.OE-Core
@@ -0,0 +1,29 @@
+OpenEmbedded-Core
+=================
+
+OpenEmbedded-Core is a layer containing the core metadata for current versions
+of OpenEmbedded. It is distro-less (can build a functional image with
+DISTRO = "nodistro") and contains only emulated machine support.
+
+For information about OpenEmbedded, see the OpenEmbedded website:
+    http://www.openembedded.org/
+
+The Yocto Project has extensive documentation about OE including a reference manual
+which can be found at:
+    http://yoctoproject.org/documentation
+
+
+Contributing
+------------
+
+Please refer to
+http://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded
+for guidelines on how to submit patches.
+
+Mailing list:
+
+    http://lists.openembedded.org/mailman/listinfo/openembedded-core
+
+Source code:
+
+    http://git.openembedded.org/openembedded-core/