Adding :isac_fix_c_arm_asm missing dependency.

TBR=phoglund@webrtc.org

Bug: None
Change-Id: I6cb1a442274a627e03a58098d74c8bbf00e492a3
Reviewed-on: https://webrtc-review.googlesource.com/46100
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21806}
diff --git a/modules/audio_coding/BUILD.gn b/modules/audio_coding/BUILD.gn
index 9442782..8cb659f 100644
--- a/modules/audio_coding/BUILD.gn
+++ b/modules/audio_coding/BUILD.gn
@@ -641,6 +641,9 @@
       "codecs/isac/fix/source/lattice_armv7.S",
       "codecs/isac/fix/source/pitch_filter_armv6.S",
     ]
+    deps = [
+      "../../system_wrappers:asm_defines",
+    ]
   }
 }