meta-quanta: gbs: detect SlimSAS cable presence

Add gpio configuration for SlimSAS cable0~3 and
detect cables connected or not

Signed-off-by: George Hung <george.hung@quantatw.com>
Change-Id: I46f48dab5f11117cd1ee1fb770ae111cbf80cf89
diff --git a/meta-gbs/recipes-gbs/detect-sas-cable/files/detect-sas-cable.service b/meta-gbs/recipes-gbs/detect-sas-cable/files/detect-sas-cable.service
new file mode 100644
index 0000000..6575f4f
--- /dev/null
+++ b/meta-gbs/recipes-gbs/detect-sas-cable/files/detect-sas-cable.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=Detect SAS Cable Manager
+Wants=phosphor-gpio-presence@.service
+After=phosphor-gpio-presence@.service
+
+[Service]
+ExecStart=/usr/bin/detect-sas-cable.sh
+StandardOutput=syslog
+Type=simple
+
+[Install]
+WantedBy=multi-user.target