AGC2 RNN VAD: remove unused dep (KissFFT)

NOTRY=True

Bug: webrtc:9577,webrtc:10480,webrtc:9139
Change-Id: I9fdf8c3bfd91d11fe01860546bcb83a78f5443fe
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/137434
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27989}
diff --git a/modules/audio_processing/agc2/rnn_vad/BUILD.gn b/modules/audio_processing/agc2/rnn_vad/BUILD.gn
index 7cf6e3d..ff4be5c 100644
--- a/modules/audio_processing/agc2/rnn_vad/BUILD.gn
+++ b/modules/audio_processing/agc2/rnn_vad/BUILD.gn
@@ -39,7 +39,6 @@
     "../../../../rtc_base:checks",
     "../../../../rtc_base:rtc_base_approved",
     "../../utility:pffft_wrapper",
-    "//third_party/rnnoise:kiss_fft",
     "//third_party/rnnoise:rnn_vad",
   ]
 }