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/meta/classes/mcextend.bbclass b/poky/meta/classes/mcextend.bbclass
new file mode 100644
index 0000000..0f8f962
--- /dev/null
+++ b/poky/meta/classes/mcextend.bbclass
@@ -0,0 +1,16 @@
+python mcextend_virtclass_handler () {
+    cls = e.data.getVar("BBEXTENDCURR")
+    variant = e.data.getVar("BBEXTENDVARIANT")
+    if cls != "mcextend" or not variant:
+        return
+
+    override = ":virtclass-mcextend-" + variant
+
+    e.data.setVar("PN", e.data.getVar("PN", False) + "-" + variant)
+    e.data.setVar("MCNAME", variant)
+    e.data.setVar("OVERRIDES", e.data.getVar("OVERRIDES", False) + override)
+}
+
+addhandler mcextend_virtclass_handler
+mcextend_virtclass_handler[eventmask] = "bb.event.RecipePreFinalise"
+