Add bstack to sensors OWNERS files

Test: n/a
Change-Id: I9e320032ee073c6ceab94312fbb114cb82f1a971
diff --git a/libs/sensor/OWNERS b/libs/sensor/OWNERS
index d4393d6..81099e8 100644
--- a/libs/sensor/OWNERS
+++ b/libs/sensor/OWNERS
@@ -1,2 +1,3 @@
 arthuri@google.com
 bduddie@google.com
+bstack@google.com