greybus: svc: add a "watchdog" to check the network health

Now that we have a svc ping command, let's add a watchdog to call it
every so often (1 second at the moment.)  If it finds something went
wrong, post a stern message to the kernel log and call:
	start unipro_reset
to reset the whole greybus hardware subsystem.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
diff --git a/drivers/staging/greybus/Makefile b/drivers/staging/greybus/Makefile
index 1e24509..1e45416 100644
--- a/drivers/staging/greybus/Makefile
+++ b/drivers/staging/greybus/Makefile
@@ -8,6 +8,7 @@
 		protocol.o	\
 		control.o	\
 		svc.o		\
+		svc_watchdog.o	\
 		firmware.o	\
 		operation.o	\
 		legacy.o