Add Witherspoon GPIO JSON

These GPIOs are used by the code in the skeleton repo.

Resolves openbmc/openbmc#3332

(From meta-ibm rev: b11913ce2ee64a085fd69146eb76a3ebff94e7ab)

Change-Id: Ic82d55bae6c7772cb8a5b836fb6138f429dd0346
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-ibm/meta-witherspoon/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend b/meta-ibm/meta-witherspoon/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend
new file mode 100644
index 0000000..72d991c
--- /dev/null
+++ b/meta-ibm/meta-witherspoon/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend
@@ -0,0 +1 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"