Add FSI enable/disable services for cronus use

Start fsi-disable.service to unbind the FSI Driver.
Start fsi-enable.service to bind it again and rescan.

Also added a fsi-bind@.service so we can ensure the
driver is bound each power on.

Change-Id: I5fa62b44994aea3bb645e755187f29e720bf3bce
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/common/recipes-phosphor/chassis/obmc-fsi/fsi-bind@.service b/common/recipes-phosphor/chassis/obmc-fsi/fsi-bind@.service
new file mode 100644
index 0000000..77c61f4
--- /dev/null
+++ b/common/recipes-phosphor/chassis/obmc-fsi/fsi-bind@.service
@@ -0,0 +1,18 @@
+[Unit]
+Description=Bind FSI Driver
+Wants=obmc-power-on@%i.target
+After=obmc-power-on@%i.target
+Wants=obmc-host-start-pre@%i.target
+Before=obmc-host-start-pre@%i.target
+Wants=fsi-scan@%i.service
+Before=fsi-scan@%i.service
+Conflicts=obmc-power-chassis-off@%i.target
+ConditionDirectoryNotEmpty=!/sys/bus/platform/drivers/fsi-master-gpio/fsi-master
+
+[Service]
+ExecStart=/bin/sh -c "echo fsi-master > /sys/bus/platform/drivers/fsi-master-gpio/bind"
+Type=oneshot
+RemainAfterExit=yes
+
+[Install]
+RequiredBy=obmc-power-chassis-on@%i.target