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__.)

Change-Id: Ic77de4b052297d77f38fc95f95f65a8ee70cf200
Signed-off-by: Julius Werner <jwerner@chromium.org>
diff --git a/plat/layerscape/common/ls_bl2_setup.c b/plat/layerscape/common/ls_bl2_setup.c
index 192eaec..35f42e1 100644
--- a/plat/layerscape/common/ls_bl2_setup.c
+++ b/plat/layerscape/common/ls_bl2_setup.c
@@ -54,10 +54,10 @@
 #endif
 			      );
 
-#ifdef AARCH32
-	enable_mmu_svc_mon(0);
-#else
+#ifdef __aarch64__
 	enable_mmu_el1(0);
+#else
+	enable_mmu_svc_mon(0);
 #endif
 }
 
@@ -74,7 +74,7 @@
 	assert(bl_mem_params);
 
 	switch (image_id) {
-#ifdef AARCH64
+#ifdef __aarch64__
 	case BL32_IMAGE_ID:
 		bl_mem_params->ep_info.spsr = ls_get_spsr_for_bl32_entry();
 		break;