Add Palmetto GPIO JSON

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

Change-Id: I5c894edae831e8cbcc29871e3e88136c219561fe
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/meta-palmetto/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend b/meta-palmetto/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend
new file mode 100644
index 0000000..72d991c
--- /dev/null
+++ b/meta-palmetto/recipes-phosphor/skeleton/obmc-libobmc-intf.bbappend
@@ -0,0 +1 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"