Add skeleton-rev class

Reduce the number of files to be updated after a
skeleton update from two to one.

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/classes/skeleton.bbclass b/classes/skeleton.bbclass
index 3faaa15..1f67333 100644
--- a/classes/skeleton.bbclass
+++ b/classes/skeleton.bbclass
@@ -1,7 +1,7 @@
 inherit obmc-phosphor-license
+inherit skeleton-rev
 
 HOMEPAGE = "http://github.com/openbmc/skeleton"
 
-SRCREV ??= "1bbc820f2b595b7a674e52bee1775c877b35b61e"
-SRC_URI += "git://github.com/openbmc/skeleton"
+SRC_URI += "${SKELETON_URI}"
 S = "${WORKDIR}/git/${SKELETON_DIR}"