rcu: Switch callers from rcu_process_gp_end() to note_gp_changes()

Because note_gp_changes() now incorporates rcu_process_gp_end() function,
this commit switches to the former and eliminates the latter.  In
addition, this commit changes external calls from __rcu_process_gp_end()
to __note_gp_changes().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 207844e..f279148 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -1628,7 +1628,7 @@
 		 */
 		if (rdp->completed != rnp->completed &&
 		    rdp->nxttail[RCU_DONE_TAIL] != rdp->nxttail[RCU_NEXT_TAIL])
-			rcu_process_gp_end(rsp, rdp);
+			note_gp_changes(rsp, rdp);
 
 		if (cpu_has_callbacks_ready_to_invoke(rdp))
 			cbs_ready = true;