avcodec/ac3: Implement float_to_fixed24 for aarch64 NEON

Signed-off-by: Geoff Hill <[email protected]>
Signed-off-by: Martin Storsjö <[email protected]>
diff --git a/libavcodec/ac3dsp.c b/libavcodec/ac3dsp.c
index 8397e03..730fa70 100644
--- a/libavcodec/ac3dsp.c
+++ b/libavcodec/ac3dsp.c
@@ -389,7 +389,9 @@
     c->downmix               = NULL;
     c->downmix_fixed         = NULL;
 
-#if ARCH_ARM
+#if ARCH_AARCH64
+    ff_ac3dsp_init_aarch64(c);
+#elif ARCH_ARM
     ff_ac3dsp_init_arm(c);
 #elif ARCH_X86
     ff_ac3dsp_init_x86(c);