Suppress spurious deprecated declaration warnings

Some generic compatibility functions emit deprecated declaration warnings
even when platforms do not use the deprecated functions directly. This
can be confusing. Suppress these warnings by using:
`#pragma GCC diagnostic ignored "-Wdeprecated-declarations"`

Also emit a runtime warning if the weak plat/common implemntation of
plat_get_syscnt_freq2() is used, as this implies the platform has not
migrated from plat_get_syscnt_freq(). The deprecated  declaration warnings
only help detect when platforms are calling deprecated functions, not when
they are defining deprecated functions.

Fixes ARM-software/tf-issues#550

Change-Id: Id14a92279c2634c1e76db8ef210da8affdbb2a5d
Signed-off-by: Dan Handley <dan.handley@arm.com>
diff --git a/bl31/bl31_context_mgmt.c b/bl31/bl31_context_mgmt.c
index 123e623..7d2c893 100644
--- a/bl31/bl31_context_mgmt.c
+++ b/bl31/bl31_context_mgmt.c
@@ -79,7 +79,13 @@
 {
 	assert(sec_state_is_valid(security_state));
 
+	/*
+	 * Suppress deprecated declaration warning in compatibility function
+	 */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 	return cm_get_context_by_index(platform_get_core_pos(mpidr), security_state);
+#pragma GCC diagnostic pop
 }
 
 /*******************************************************************************
@@ -90,8 +96,14 @@
 {
 	assert(sec_state_is_valid(security_state));
 
+	/*
+	 * Suppress deprecated declaration warning in compatibility function
+	 */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 	cm_set_context_by_index(platform_get_core_pos(mpidr),
 						 context, security_state);
+#pragma GCC diagnostic pop
 }
 
 /*******************************************************************************
@@ -104,7 +116,15 @@
 	if ((mpidr & MPIDR_AFFINITY_MASK) ==
 			(read_mpidr_el1() & MPIDR_AFFINITY_MASK))
 		cm_init_my_context(ep);
-	else
+	else {
+		/*
+		 * Suppress deprecated declaration warning in compatibility
+		 * function
+		 */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 		cm_init_context_by_index(platform_get_core_pos(mpidr), ep);
+#pragma GCC diagnostic pop
+	}
 }
-#endif
+#endif /* ERROR_DEPRECATED */