Add OWNERS file to ExtServices watchdog/ directory

Test: n/a
Change-Id: Ife82ec90e3c97949f208d58ef24d527d17fc2748
Exempt-From-Owner-Approval: Approval from owner in master
diff --git a/src/android/ext/services/watchdog/OWNERS b/src/android/ext/services/watchdog/OWNERS
new file mode 100644
index 0000000..48a6110
--- /dev/null
+++ b/src/android/ext/services/watchdog/OWNERS
@@ -0,0 +1,2 @@
+gavincorkery@google.com
+olilan@google.com