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/include/lib/xlat_tables/xlat_mmu_helpers.h b/include/lib/xlat_tables/xlat_mmu_helpers.h
index efe0dd5..abdf1b6 100644
--- a/include/lib/xlat_tables/xlat_mmu_helpers.h
+++ b/include/lib/xlat_tables/xlat_mmu_helpers.h
@@ -65,14 +65,7 @@
 		   const uint64_t *base_table, unsigned long long max_pa,
 		   uintptr_t max_va, int xlat_regime);
 
-#ifdef AARCH32
-/* AArch32 specific translation table API */
-void enable_mmu_svc_mon(unsigned int flags);
-void enable_mmu_hyp(unsigned int flags);
-
-void enable_mmu_direct_svc_mon(unsigned int flags);
-void enable_mmu_direct_hyp(unsigned int flags);
-#else
+#ifdef __aarch64__
 /* AArch64 specific translation table APIs */
 void enable_mmu_el1(unsigned int flags);
 void enable_mmu_el2(unsigned int flags);
@@ -81,7 +74,14 @@
 void enable_mmu_direct_el1(unsigned int flags);
 void enable_mmu_direct_el2(unsigned int flags);
 void enable_mmu_direct_el3(unsigned int flags);
-#endif /* AARCH32 */
+#else
+/* AArch32 specific translation table API */
+void enable_mmu_svc_mon(unsigned int flags);
+void enable_mmu_hyp(unsigned int flags);
+
+void enable_mmu_direct_svc_mon(unsigned int flags);
+void enable_mmu_direct_hyp(unsigned int flags);
+#endif /* __aarch64__ */
 
 bool xlat_arch_is_granule_size_supported(size_t size);
 size_t xlat_arch_get_max_supported_granule_size(void);