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/yocto-poky/meta/classes/kernel-grub.bbclass b/import-layers/yocto-poky/meta/classes/kernel-grub.bbclass
index f7dcc07..5d92f3b 100644
--- a/import-layers/yocto-poky/meta/classes/kernel-grub.bbclass
+++ b/import-layers/yocto-poky/meta/classes/kernel-grub.bbclass
@@ -92,7 +92,7 @@
 	fi
 '''
 
-    imagetypes = d.getVar('KERNEL_IMAGETYPES', True)
+    imagetypes = d.getVar('KERNEL_IMAGETYPES')
     imagetypes = re.sub(r'\.gz$', '', imagetypes)
 
     for type in imagetypes.split():