services: fix switch statements to comply with MISRA rules

Ensure (where possible) that switch statements in services comply with
MISRA rules 16.1 - 16.7.

Change-Id: I47bf6ed4a026201e6fe125ce51842482e99e8bb0
Signed-off-by: Jonathan Wright <jonathan.wright@arm.com>
diff --git a/services/spd/tlkd/tlkd_main.c b/services/spd/tlkd/tlkd_main.c
index cb68bff..da3b732 100644
--- a/services/spd/tlkd/tlkd_main.c
+++ b/services/spd/tlkd/tlkd_main.c
@@ -350,6 +350,7 @@
 		 * context.
 		 */
 		tlkd_synchronous_sp_exit(&tlk_ctx, x1);
+		break;
 
 	/*
 	 * These function IDs are used only by TLK to indicate it has
@@ -375,6 +376,7 @@
 		 * return value to the caller
 		 */
 		tlkd_synchronous_sp_exit(&tlk_ctx, x1);
+		break;
 
 	/*
 	 * Return the number of service function IDs implemented to