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/lib/locks/bakery/bakery_lock_normal.c b/lib/locks/bakery/bakery_lock_normal.c
index cc13fc1..f906f51 100644
--- a/lib/locks/bakery/bakery_lock_normal.c
+++ b/lib/locks/bakery/bakery_lock_normal.c
@@ -167,10 +167,10 @@
 	unsigned int their_bakery_data;
 
 	me = plat_my_core_pos();
-#ifdef AARCH32
-	is_cached = read_sctlr() & SCTLR_C_BIT;
-#else
+#ifdef __aarch64__
 	is_cached = read_sctlr_el3() & SCTLR_C_BIT;
+#else
+	is_cached = read_sctlr() & SCTLR_C_BIT;
 #endif
 
 	/* Get a ticket */
@@ -228,10 +228,10 @@
 void bakery_lock_release(bakery_lock_t *lock)
 {
 	bakery_info_t *my_bakery_info;
-#ifdef AARCH32
-	unsigned int is_cached = read_sctlr() & SCTLR_C_BIT;
-#else
+#ifdef __aarch64__
 	unsigned int is_cached = read_sctlr_el3() & SCTLR_C_BIT;
+#else
+	unsigned int is_cached = read_sctlr() & SCTLR_C_BIT;
 #endif
 
 	my_bakery_info = get_bakery_info(plat_my_core_pos(), lock);