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/documentation/dev-manual/dev-manual-qemu.xml b/poky/documentation/dev-manual/dev-manual-qemu.xml
index 4e7b5de..f5a0d64 100644
--- a/poky/documentation/dev-manual/dev-manual-qemu.xml
+++ b/poky/documentation/dev-manual/dev-manual-qemu.xml
@@ -590,6 +590,9 @@
                     <filename>nographic</filename>:
                     Disables the video console, which sets the console to
                     "ttys0".
+                    This option is useful when you have logged into a server
+                    and you do not want to disable forwarding from the
+                    X Window System (X11) to your workstation or laptop.
                     </para></listitem>
                 <listitem><para>
                     <filename>serial</filename>: