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-raspberrypi/recipes-graphics/userland/files/0008-Remove-RPC_FLUSH.patch b/meta-raspberrypi/recipes-graphics/userland/files/0008-Remove-RPC_FLUSH.patch
index a100e39..bd6c2ff 100644
--- a/meta-raspberrypi/recipes-graphics/userland/files/0008-Remove-RPC_FLUSH.patch
+++ b/meta-raspberrypi/recipes-graphics/userland/files/0008-Remove-RPC_FLUSH.patch
@@ -1,4 +1,4 @@
-From 14c22987dfa9fec02794856cd15b2d64b4b81c32 Mon Sep 17 00:00:00 2001
+From 4312ce4f9320b25f513c4d8fa163f9d8faebfd97 Mon Sep 17 00:00:00 2001
 From: Khem Raj <raj.khem@gmail.com>
 Date: Sat, 6 Feb 2016 11:09:18 -0800
 Subject: [PATCH 08/18] Remove RPC_FLUSH
@@ -23,5 +23,5 @@
        }
  #endif
 -- 
-2.19.1
+2.20.1