meta-intel: s2600wf: add machine suffix

Add machine suffix to obmc-libobmc-intf recipe.  This allows
multi-machine distros based on OpenBMC to safely include the meta-intel
layer.

(From meta-intel rev: f3894c2a3603a9ca9821ee67e02b6a7db0447477)

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ic3e8377da6492538bf0e0b7d5e5bfdaa3273503d
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-intel/meta-s2600wf/recipes-phosphor/skeleton/obmc-libobmc-intf_%.bbappend b/meta-intel/meta-s2600wf/recipes-phosphor/skeleton/obmc-libobmc-intf_%.bbappend
index 72d991c..410b21b 100644
--- a/meta-intel/meta-s2600wf/recipes-phosphor/skeleton/obmc-libobmc-intf_%.bbappend
+++ b/meta-intel/meta-s2600wf/recipes-phosphor/skeleton/obmc-libobmc-intf_%.bbappend
@@ -1 +1 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS_prepend_s2600wf := "${THISDIR}/${PN}:"