Remove references to old project name from common files

The project has been renamed from "Arm Trusted Firmware (ATF)" to
"Trusted Firmware-A (TF-A)" long ago. A few references to the old
project name that still remained in various places have now been
removed.

This change doesn't affect any platform files. Any "ATF" references
inside platform files, still remain.

Change-Id: Id97895faa5b1845e851d4d50f5750de7a55bf99e
Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>
diff --git a/bl32/optee/optee.mk b/bl32/optee/optee.mk
index 462020f..c8aa7ce 100644
--- a/bl32/optee/optee.mk
+++ b/bl32/optee/optee.mk
@@ -1,10 +1,10 @@
 #
-# Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2016-2019, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
-# This makefile only aims at complying with ARM Trusted Firmware build process so
-# that "optee" is a valid ARM Trusted Firmware AArch32 Secure Playload identifier.
+# This makefile only aims at complying with Trusted Firmware-A build process so
+# that "optee" is a valid TF-A AArch32 Secure Playload identifier.
 
 ifneq ($(ARCH),aarch32)
 $(error This directory targets AArch32 support)
@@ -12,4 +12,4 @@
 
 $(eval $(call add_define,AARCH32_SP_OPTEE))
 
-$(info ARM Trusted Firmware built for OP-TEE payload support)
+$(info Trusted Firmware-A built for OP-TEE payload support)