meta-zaius: obmc-libobmc-intf: add machine suffix

For obmc-libobmc-intf, add zaius machine suffix to avoid poisoning other
machines using this layer.

Change-Id: I1e87d69e01523dc8681887c2b140887ad62a4e7a
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/meta-zaius/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend b/meta-zaius/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend
index 72d991c..2072afd 100644
--- a/meta-zaius/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend
+++ b/meta-zaius/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend
@@ -1 +1 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS_prepend_zaius := "${THISDIR}/${PN}:"