Driver core: remove subsys_get()

There are no more subsystems, it's a kset now so remove the function and
the only two users, which are in the driver core.


Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 50e3413..3e9b04c 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -93,7 +93,7 @@
 static struct class *class_get(struct class *cls)
 {
 	if (cls)
-		return container_of(subsys_get(&cls->subsys), struct class, subsys);
+		return container_of(kset_get(&cls->subsys), struct class, subsys);
 	return NULL;
 }