Add @SensitiveData to GateKeeperService

Bug: 171501998
Test: Builds and manual evaluation
Change-Id: Ic62ca4b35529b2066cd536c5b414a53e254f808c
diff --git a/gatekeeperd/binder/android/service/gatekeeper/IGateKeeperService.aidl b/gatekeeperd/binder/android/service/gatekeeper/IGateKeeperService.aidl
index 4646efc..67e8633 100644
--- a/gatekeeperd/binder/android/service/gatekeeper/IGateKeeperService.aidl
+++ b/gatekeeperd/binder/android/service/gatekeeper/IGateKeeperService.aidl
@@ -27,6 +27,7 @@
  *
  * @hide
  */
+@SensitiveData
 interface IGateKeeperService {
     /**
      * Enrolls a password, returning the handle to the enrollment to be stored locally.