Add GPIO Presence

Add the GPIO Presence service file and needed Witherspoon
conf files for power supply GPIO presence detection.

Resolves openbmc/openbmc#1329

Change-Id: Ie8d5e3e6c2bda1c85fd10a4cffacfdd7ce9840ae
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/meta-witherspoon/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend b/meta-witherspoon/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend
index db27edc..f2756d0 100644
--- a/meta-witherspoon/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend
+++ b/meta-witherspoon/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend
@@ -1,2 +1,2 @@
-RDEPENDS_${PN}-inventory += "openpower-fru-vpd openpower-occ-control phosphor-cooling-type"
+RDEPENDS_${PN}-inventory += "openpower-fru-vpd openpower-occ-control phosphor-cooling-type virtual/obmc-gpio-presence"
 RDEPENDS_${PN}-fan-control += "witherspoon-fan-watchdog"