skeleton-rev.bbclass: bump version

Change-Id: I4a06bf81aecb082195d6bfe2a9f96300823deb82
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meta-phosphor/classes/skeleton-rev.bbclass b/meta-phosphor/classes/skeleton-rev.bbclass
index 5f7e97b..8534ff0 100644
--- a/meta-phosphor/classes/skeleton-rev.bbclass
+++ b/meta-phosphor/classes/skeleton-rev.bbclass
@@ -1,2 +1,2 @@
-SRCREV ?= "a7ac805b407617f7a83eb152ff823f44d243a9b2"
+SRCREV ?= "520f8b05742916b920f20ac916a0e20fb981ce56"
 SKELETON_URI ?= "git://github.com/openbmc/skeleton"