reset upstream subtrees to yocto 2.6

Reset the following subtrees on thud HEAD:

  poky: 87e3a9739d
  meta-openembedded: 6094ae18c8
  meta-security: 31dc4e7532
  meta-raspberrypi: a48743dc36
  meta-xilinx: c42016e2e6

Also re-apply backports that didn't make it into thud:
  poky:
    17726d0 systemd-systemctl-native: handle Install wildcards

  meta-openembedded:
    4321a5d libtinyxml2: update to 7.0.1
    042f0a3 libcereal: Add native and nativesdk classes
    e23284f libcereal: Allow empty package
    030e8d4 rsyslog: curl-less build with fmhttp PACKAGECONFIG
    179a1b9 gtest: update to 1.8.1

Squashed OpenBMC subtree compatibility updates:
  meta-aspeed:
    Brad Bishop (1):
          aspeed: add yocto 2.6 compatibility

  meta-ibm:
    Brad Bishop (1):
          ibm: prepare for yocto 2.6

  meta-ingrasys:
    Brad Bishop (1):
          ingrasys: set layer compatibility to yocto 2.6

  meta-openpower:
    Brad Bishop (1):
          openpower: set layer compatibility to yocto 2.6

  meta-phosphor:
    Brad Bishop (3):
          phosphor: set layer compatibility to thud
          phosphor: libgpg-error: drop patches
          phosphor: react to fitimage artifact rename

    Ed Tanous (4):
          Dropbear: upgrade options for latest upgrade
          yocto2.6: update openssl options
          busybox: remove upstream watchdog patch
          systemd: Rebase CONFIG_CGROUP_BPF patch

Change-Id: I7b1fe71cca880d0372a82d94b5fd785323e3a9e7
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-xilinx/meta-xilinx-bsp/conf/machine/zybo-zynq7.conf b/meta-xilinx/meta-xilinx-bsp/conf/machine/zybo-zynq7.conf
index 5b40563..049add9 100644
--- a/meta-xilinx/meta-xilinx-bsp/conf/machine/zybo-zynq7.conf
+++ b/meta-xilinx/meta-xilinx-bsp/conf/machine/zybo-zynq7.conf
@@ -11,18 +11,18 @@
 require conf/machine/include/tune-zynq.inc
 require conf/machine/include/machine-xilinx-overrides.inc
 require conf/machine/include/machine-xilinx-default.inc
-require conf/machine/include/machine-xilinx-board.inc
 
 MACHINE_FEATURES = "ext2 vfat usbhost usbgadget"
 
 # u-boot configuration
 PREFERRED_PROVIDER_virtual/bootloader = "u-boot"
 UBOOT_MACHINE = "zynq_zybo_config"
-SPL_BINARY = "spl/boot.bin"
+SPL_BINARY ?= "spl/boot.bin"
 
 EXTRA_IMAGEDEPENDS += " \
 		u-boot-zynq-uenv \
 		virtual/boot-bin \
+		virtual/bootloader \
 		"
 
 SERIAL_CONSOLE = "115200 ttyPS0"
@@ -31,7 +31,6 @@
 
 IMAGE_BOOT_FILES += " \
 		boot.bin \
-		${KERNEL_IMAGETYPE}-zynq-zybo.dtb \
 		uEnv.txt \
 		"