Update Arm TF references to TF-A

Update Arm Trusted Firmware references in the upstream documents to
Trusted Firmware-A (TF-A). This is for consistency with and
disambiguation from Trusted Firmware-M (TF-M).

Also update other Arm trademarks, e.g. ARM->Arm, ARMv8->Armv8-A.

Change-Id: I8bb0e18af29c6744eeea2dc6c08f2c10b20ede22
Signed-off-by: Dan Handley <dan.handley@arm.com>
Signed-off-by: David Cunado <david.cunado@arm.com>
diff --git a/license.rst b/license.rst
index c51e595..a4464d9 100644
--- a/license.rst
+++ b/license.rst
@@ -1,4 +1,4 @@
-Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+Copyright (c) 2013-2018, 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:
@@ -10,7 +10,7 @@
    list of conditions and the following disclaimer in the documentation and/or
    other materials provided with the distribution.
 
--  Neither the name of ARM nor the names of its contributors may be used to
+-  Neither the name of Arm nor the names of its contributors may be used to
    endorse or promote products derived from this software without specific prior
    written permission.