Swift power supply presence detects

PS0 uses the same GPIO that witherspoon uses, but PS1
uses GPIOR7 (143).

Tested: Built both images, made sure the correct conf files
        showed up in rootfs.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Id12161a921e68ce44a2a74181b4eeda1ff41d916
diff --git a/meta-witherspoon/recipes-phosphor/gpio/phosphor-gpio-monitor_%.bbappend b/meta-witherspoon/recipes-phosphor/gpio/phosphor-gpio-monitor_%.bbappend
index 0fa1105..bd39db5 100644
--- a/meta-witherspoon/recipes-phosphor/gpio/phosphor-gpio-monitor_%.bbappend
+++ b/meta-witherspoon/recipes-phosphor/gpio/phosphor-gpio-monitor_%.bbappend
@@ -1,4 +1,4 @@
-FILESEXTRAPATHS_append := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS_append := "${THISDIR}/${PN}:${THISDIR}/${PN}/${MACHINE}:"
 
 TMPL_POWERSUPPLY = "phosphor-gpio-presence@.service"
 INSTFMT_POWERSUPPLY = "phosphor-gpio-presence@{0}.service"