Update terminology: standard SMC to yielding SMC

Since Issue B (November 2016) of the SMC Calling Convention document
standard SMC calls are renamed to yielding SMC calls to help avoid
confusion with the standard service SMC range, which remains unchanged.

http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf

This patch adds a new define for yielding SMC call type and deprecates
the current standard SMC call type. The tsp is migrated to use this new
terminology and, additionally, the documentation and code comments are
updated to use this new terminology.

Change-Id: I0d7cc0224667ee6c050af976745f18c55906a793
Signed-off-by: David Cunado <david.cunado@arm.com>
diff --git a/common/runtime_svc.c b/common/runtime_svc.c
index df0d64c..52990b3 100644
--- a/common/runtime_svc.c
+++ b/common/runtime_svc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -93,7 +93,8 @@
 	if (desc->end_oen >= OEN_LIMIT)
 		return -EINVAL;
 
-	if (desc->call_type != SMC_TYPE_FAST && desc->call_type != SMC_TYPE_STD)
+	if (desc->call_type != SMC_TYPE_FAST &&
+			desc->call_type != SMC_TYPE_YIELD)
 		return -EINVAL;
 
 	/* A runtime service having no init or handle function doesn't make sense */
@@ -143,7 +144,7 @@
 
 		/*
 		 * The runtime service may have separate rt_svc_desc_t
-		 * for its fast smc and standard smc. Since the service itself
+		 * for its fast smc and yielding smc. Since the service itself
 		 * need to be initialized only once, only one of them will have
 		 * an initialisation routine defined. Call the initialisation
 		 * routine for this runtime service, if it is defined.