Add owners for KeyChain code

Add the Android Enterprise Security team as OWNERS for KeyChain and
KeyChain-related code.

The KeyChain code currently lives under keystore/, which means every
change requires Keystore owners approval, but it does not make sense for
KeyChain as KeyChain is a Keystore client and is developed
independently.

Test: Gerritt upload.
Bug: 33166666
Change-Id: Idfedda9553add303439179ce10a1e75e437bbe83
diff --git a/keystore/java/android/security/OWNERS b/keystore/java/android/security/OWNERS
new file mode 100644
index 0000000..ed30587
--- /dev/null
+++ b/keystore/java/android/security/OWNERS
@@ -0,0 +1 @@
+per-file *.java,*.aidl = eranm@google.com,pgrafov@google.com,rubinxu@google.com
diff --git a/keystore/tests/OWNERS b/keystore/tests/OWNERS
new file mode 100644
index 0000000..9e65f88
--- /dev/null
+++ b/keystore/tests/OWNERS
@@ -0,0 +1,5 @@
+# Android Enterprise security team
+eranm@google.com
+irinaid@google.com
+pgrafov@google.com
+rubinxu@google.com