Switch AARCH32/AARCH64 to __aarch64__

NOTE: AARCH32/AARCH64 macros are now deprecated in favor of __aarch64__.

All common C compilers pre-define the same macros to signal which
architecture the code is being compiled for: __arm__ for AArch32 (or
earlier versions) and __aarch64__ for AArch64. There's no need for TF-A
to define its own custom macros for this. In order to unify code with
the export headers (which use __aarch64__ to avoid another dependency),
let's deprecate the AARCH32 and AARCH64 macros and switch the code base
over to the pre-defined standard macro. (Since it is somewhat
unintuitive that __arm__ only means AArch32, let's standardize on only
using __aarch64__.)

NOTE: This change is based on below TFA commit
https://github.com/ARM-software/arm-trusted-firmware/commit/402b3cf8766fe2cb4ae462f7ee7761d08a1ba56c

Signed-off-by: Deepika Bhavnani <deepika.bhavnani@arm.com>
Change-Id: If2c3dbaeb01d4a9d8cfd95d906e5eaf4ae94417f
diff --git a/tftf/tests/misc_tests/inject_serror.S b/tftf/tests/misc_tests/inject_serror.S
index 0d7dbf2..008503f 100644
--- a/tftf/tests/misc_tests/inject_serror.S
+++ b/tftf/tests/misc_tests/inject_serror.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -9,7 +9,7 @@
 #include <sdei.h>
 
 
-#ifdef AARCH64
+#ifdef __aarch64__
 	.globl	inject_serror
 	.globl	inject_uncontainable
 	.globl	serror_sdei_event_handler
diff --git a/tftf/tests/misc_tests/test_pmu_leakage.c b/tftf/tests/misc_tests/test_pmu_leakage.c
index da28999..36b3138 100644
--- a/tftf/tests/misc_tests/test_pmu_leakage.c
+++ b/tftf/tests/misc_tests/test_pmu_leakage.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, Arm Limited. All rights reserved.
+ * Copyright (c) 2019-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -75,7 +75,7 @@
 	unsigned long long avg;
 };
 
-#ifdef AARCH64
+#ifdef __aarch64__
 #define V8_2_DEBUG_ARCH_SUPPORTED ID_AA64DFR0_V8_2_DEBUG_ARCH_SUPPORTED
 #else
 #define V8_2_DEBUG_ARCH_SUPPORTED DBGDIDR_V8_2_DEBUG_ARCH_SUPPORTED
diff --git a/tftf/tests/misc_tests/test_single_fault.c b/tftf/tests/misc_tests/test_single_fault.c
index e652211..f55d8de 100644
--- a/tftf/tests/misc_tests/test_single_fault.c
+++ b/tftf/tests/misc_tests/test_single_fault.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -9,7 +9,7 @@
 #include <sdei.h>
 #include <tftf_lib.h>
 
-#ifndef AARCH32
+#ifdef __aarch64__
 
 uint64_t serror_received;
 
diff --git a/tftf/tests/misc_tests/test_uncontainable.c b/tftf/tests/misc_tests/test_uncontainable.c
index 79c9031..231e5e8 100644
--- a/tftf/tests/misc_tests/test_uncontainable.c
+++ b/tftf/tests/misc_tests/test_uncontainable.c
@@ -1,12 +1,12 @@
 /*
- * Copyright (c) 2018, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #include <tftf_lib.h>
 
-#ifndef AARCH32
+#ifdef __aarch64__
 
 extern void inject_uncontainable(void);