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/conf/machine/include/arm/arch-arm64.inc b/poky/meta/conf/machine/include/arm/arch-arm64.inc
index 5f90763..53f4566 100644
--- a/poky/meta/conf/machine/include/arm/arch-arm64.inc
+++ b/poky/meta/conf/machine/include/arm/arch-arm64.inc
@@ -4,7 +4,7 @@
 
 TUNEVALID[aarch64] = "Enable instructions for aarch64"
 
-MACHINEOVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'aarch64', ':aarch64', '' ,d)}"
+MACHINEOVERRIDES =. "${@bb.utils.contains('TUNE_FEATURES', 'aarch64', 'aarch64:', '' ,d)}"
 
 # Little Endian base configs
 AVAILTUNES += "aarch64 aarch64_be"