phosphor-networkd-rev.bbclass: bump version

Change-Id: Ica44781fd014a2eed9ca88805bf8657bba0a378a
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/classes/phosphor-networkd-rev.bbclass b/classes/phosphor-networkd-rev.bbclass
index 26acbdc..3d3f098 100644
--- a/classes/phosphor-networkd-rev.bbclass
+++ b/classes/phosphor-networkd-rev.bbclass
@@ -1,2 +1,2 @@
 SRC_URI += "git://github.com/openbmc/phosphor-networkd"
-SRCREV = "c9645fe5c874930445bca6ba51ac9daee916c99b"
+SRCREV = "66b974d2d679ece3aa67032bbc13ac166702cede"