greybus: Documentation/sysfs: add entry for control device

Add an entry for the recently added interface control device.

Also move the bundle-device entry below the control-device entries.
Reported-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/Documentation/sysfs-bus-greybus

@@ -88,13 +88,13 @@ Contact:	Greg Kroah-Hartman <greg@kroah.com>
 Description:
 		Power measurement of the interface in microwatts (uW)
 
-What:		/sys/bus/greybus/device/N-I.B
+What:		/sys/bus/greybus/device/N-I.ctrl
 Date:		October 2015
 KernelVersion:	4.XX
 Contact:	Greg Kroah-Hartman <greg@kroah.com>
 Description:
-		A bundle B on the Interface I, B is replaced by a 1-byte
-		number representing the bundle.
+		Abstract control device for interface I that represents the
+		current mode of an enumerated Greybus interface.
 
 What:		/sys/bus/greybus/device/N-I.ctrl/product_string
 Date:		October 2015
@@ -110,6 +110,14 @@ Contact:	Greg Kroah-Hartman <greg@kroah.com>
 Description:
 		Vendor ID string of a Greybus interface.
 
+What:		/sys/bus/greybus/device/N-I.B
+Date:		October 2015
+KernelVersion:	4.XX
+Contact:	Greg Kroah-Hartman <greg@kroah.com>
+Description:
+		A bundle B on the Interface I, B is replaced by a 1-byte
+		number representing the bundle.
+
 What:		/sys/bus/greybus/device/N-I.B/bundle_class
 Date:		October 2015
 KernelVersion:	4.XX