init: Add the ability to start services with dynamic arguments.

    To add arguments dynamically to a service, start the service like so:

    setprop ctl.start service_to_run:arg1 arg2 arg3...

    To start a service with *no* dynamic arguments, start the service normally:

    setprop ctl.start service_to_run

    Dynamic arguments are only supported on 'oneshot' services

Signed-off-by: San Mehat <san@google.com>
diff --git a/init/init.h b/init/init.h
index b93eb50..f306b7b 100644
--- a/init/init.h
+++ b/init/init.h
@@ -116,6 +116,8 @@
 
 #define NR_SVC_SUPP_GIDS 6    /* six supplementary groups */
 
+#define SVC_MAXARGS 64
+
 struct service {
         /* list of all services */
     struct listnode slist;
@@ -160,7 +162,7 @@
 void service_for_each_flags(unsigned matchflags,
                             void (*func)(struct service *svc));
 void service_stop(struct service *svc);
-void service_start(struct service *svc);
+void service_start(struct service *svc, const char *dynamic_args);
 void property_changed(const char *name, const char *value);
 
 struct action *action_remove_queue_head(void);