meta-facebook: layer.conf: Add warrior compatibility

oe-core branched in preparation for the upcoming 2.7 Yocto release and
as of 13e45ff requires core layer compatibility to "warrior" instead of
"thud".  We'll retain compatibility for both until we do our own branch
or stop testing thud.

(From meta-facebook rev: ecbe3814cf69ecf51052ac9f0129306f9fd2dd78)

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Icd1ed7dd25f959f888f1125ad47bdbb2b16c02e1
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-facebook/conf/layer.conf b/meta-facebook/conf/layer.conf
index 59bdc48..3e5c15c 100644
--- a/meta-facebook/conf/layer.conf
+++ b/meta-facebook/conf/layer.conf
@@ -7,4 +7,4 @@
 
 BBFILE_COLLECTIONS += "facebook-layer"
 BBFILE_PATTERN_facebook-layer = ""
-LAYERSERIES_COMPAT_facebook-layer = "thud"
+LAYERSERIES_COMPAT_facebook-layer = "thud warrior"