meta-bletchley: detect-gpio-present: sled present managerment service

A service to monitor the presence status of sleds and perform
corresponding actions when sleds are inserted or removed.

This patch require phosphor-gpio-monitor-presence enabled and gpio-keys
defined in kernel dts file, the LORE link as below.
* https://lore.kernel.org/all/20220613095150.21917-4-potin.lai.pt@gmail.com/

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: Id43c7c5c40ccad904db3e6d55870b154a68626ca
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 65531cb..1ce8907 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
@@ -8,4 +8,5 @@
     fw-update \
     phosphor-sel-logger \
     phosphor-gpio-monitor-presence \
+    detect-sled-present \
 "