build: always prefix section names with `.`

Some of our specialized sections are not prefixed with the conventional
period. The compiler uses input section names to derive certain other
section names (e.g. `.rela.text`, `.relacpu_ops`), and these can be
difficult to select in linker scripts when there is a lack of a
delimiter.

This change introduces the period prefix to all specialized section
names.

BREAKING-CHANGE: All input and output linker section names have been
 prefixed with the period character, e.g. `cpu_ops` -> `.cpu_ops`.

Change-Id: I51c13c5266d5975fbd944ef4961328e72f82fc1c
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/include/lib/el3_runtime/pubsub.h b/include/lib/el3_runtime/pubsub.h
index 64fe5cc..cbd8ecc 100644
--- a/include/lib/el3_runtime/pubsub.h
+++ b/include/lib/el3_runtime/pubsub.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2023, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -12,7 +12,7 @@
 /* For the linker ... */
 #define __pubsub_start_sym(event)	__pubsub_##event##_start
 #define __pubsub_end_sym(event)		__pubsub_##event##_end
-#define __pubsub_section(event)		__pubsub_##event
+#define __pubsub_section(event)		.__pubsub_##event
 
 /*
  * REGISTER_PUBSUB_EVENT has a different definition between linker and compiler
@@ -54,7 +54,7 @@
 #define __pubsub_end_sym(event)		__pubsub_##event##_end
 #endif
 
-#define __pubsub_section(event)		__section("__pubsub_" #event)
+#define __pubsub_section(event)		__section(".__pubsub_" #event)
 
 /*
  * In compiler context, REGISTER_PUBSUB_EVENT declares the per-event symbols