Fix android_arm_rel on Chromium Roll.

Error: https://ci.chromium.org/p/webrtc/builders/try/android_arm_rel/18894

  Exception: Missing licenses for following third_party targets: nasm

No-Try: True
Bug: None
Change-Id: I2b916d3063ca3019ec3fa473b9ba4375905f538b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/172626
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30965}

tools_webrtc/libs/generate_licenses.py

@@ -54,6 +54,7 @@ LIB_TO_LICENSES_DICT = {
     'libsrtp': ['third_party/libsrtp/LICENSE'],
     'libvpx': ['third_party/libvpx/source/libvpx/LICENSE'],
     'libyuv': ['third_party/libyuv/LICENSE'],
+    'nasm': ['third_party/nasm/LICENSE'],
     'opus': ['third_party/opus/src/COPYING'],
     'pffft': ['third_party/pffft/LICENSE'],
     'protobuf': ['third_party/protobuf/LICENSE'],