Adding mbonadei@ to build_overrides/OWNERS.

Bug: None
Change-Id: I40b3f5371d86054872e17381d612b888637861dc
No-Try: True
Reviewed-on: https://webrtc-review.googlesource.com/c/110864
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25630}
diff --git a/build_overrides/OWNERS b/build_overrides/OWNERS
index 524e267..5465ed8 100644
--- a/build_overrides/OWNERS
+++ b/build_overrides/OWNERS
@@ -1 +1,2 @@
+mbonadei@webrtc.org
 phoglund@webrtc.org