Add bstack to sensors OWNERS file

Test: n/a
Change-Id: I25ae89abe1dfe1552e92cccf0354a269959c0c13
diff --git a/modules/sensors/OWNERS b/modules/sensors/OWNERS
index d4393d6..81099e8 100644
--- a/modules/sensors/OWNERS
+++ b/modules/sensors/OWNERS
@@ -1,2 +1,3 @@
 arthuri@google.com
 bduddie@google.com
+bstack@google.com