Bug 1761339 - Fix define to change the audiosink depth on M1 Macs. r=alwu DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D141988

modules/libpref/init/StaticPrefList.yaml

@@ -9602,7 +9602,7 @@
 # reached. The total size of the ring-buffer is slightly bigger than this.
 - name: media.audio.audiosink.threshold_ms
   type: AtomicFloat
-#if defined(XP_MACOSX) && defined(__aarch64__)
+#if defined(XP_MACOSX) && defined(MOZ_AARCH64)
   value: 1000.0
 #else
   value: 200.0