hw/microblaze: Replace TARGET_BIG_ENDIAN -> target_big_endian()

Check endianness at runtime to remove the target-specific
TARGET_BIG_ENDIAN definition.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20260106235333.22752-6-philmd@linaro.org>

hw/microblaze/petalogix_s3adsp1800_mmu.c

@@ -24,6 +24,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/target-info.h"
 #include "qemu/units.h"
 #include "qapi/error.h"
 #include "cpu.h"
@@ -177,7 +178,8 @@ static void petalogix_s3adsp1800_machine_class_init(ObjectClass *oc,
                                           &EndianMode_lookup,
                                           machine_get_endianness,
                                           machine_set_endianness);
-    object_property_set_default_str(prop, TARGET_BIG_ENDIAN ? "big" : "little");
+    object_property_set_default_str(prop, target_big_endian() ? "big"
+                                                              : "little");
     object_class_property_set_description(oc, "endianness",
             "Defines whether the machine runs in big or little endian mode");
 }