Yocto 2.3

Move OpenBMC to Yocto 2.3(pyro).

Tested: Built and verified Witherspoon and Palmetto images
Change-Id: I50744030e771f4850afc2a93a10d3507e76d36bc
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Resolves: openbmc/openbmc#2461
diff --git a/import-layers/meta-virtualization/recipes-extended/xen/xen-arch.inc b/import-layers/meta-virtualization/recipes-extended/xen/xen-arch.inc
index 844d47d..fb0093e 100644
--- a/import-layers/meta-virtualization/recipes-extended/xen/xen-arch.inc
+++ b/import-layers/meta-virtualization/recipes-extended/xen/xen-arch.inc
@@ -6,7 +6,7 @@
 
 def map_xen_arch(a, d):
     import re
-    valid_archs = d.getVar('valid_xen_archs', True).split()
+    valid_archs = d.getVar('valid_xen_archs').split()
 
     if   re.match("i.86", a):        return "x86_32"
     elif re.match("x86.64", a):      return "x86_64"