meta-bletchley: phosphor-gpio-monitor: enable gpio presence feature

Ebable phosphor-gpio-monitor-presence feature, create service file and
environment file for each presence-sledX pin.

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I8ab59a635e22404457c42be152f4a033a173d930
diff --git a/meta-facebook/meta-bletchley/recipes-phosphor/images/fb-bletchley-phosphor-image.inc b/meta-facebook/meta-bletchley/recipes-phosphor/images/fb-bletchley-phosphor-image.inc
index f510041..65531cb 100644
--- a/meta-facebook/meta-bletchley/recipes-phosphor/images/fb-bletchley-phosphor-image.inc
+++ b/meta-facebook/meta-bletchley/recipes-phosphor/images/fb-bletchley-phosphor-image.inc
@@ -7,4 +7,5 @@
     idevicerestore \
     fw-update \
     phosphor-sel-logger \
+    phosphor-gpio-monitor-presence \
 "