Add mgeisler to Rust owners am: e05ae145f1 am: 5321c0446d am: eab78edf67

Original change: https://android-review.googlesource.com/c/platform/prebuilts/rust/+/2026926

Change-Id: I5e8019f03151baeaa742b4935cad938e15dc275b
diff --git a/OWNERS b/OWNERS
index 0efff27..a29eebc 100644
--- a/OWNERS
+++ b/OWNERS
@@ -4,6 +4,7 @@
 chriswailes@google.com
 ivanlozano@google.com
 jeffv@google.com
+mgeisler@google.com
 mmaurer@google.com
 qwandor@google.com
 srhines@google.com