Set device credential's Window flag to be SECURE.

This prevents showing any pattern/pin in recent list.

Change-Id: I445cbad99344a2fcc335a5aad4a4de026ae97441
Merged-In: Ie56f725bf245961d61a66eae8a82b728600cb650
Fixes: 64339515
Bug: 38258991
Test: manual
2 files changed