Add new config config_supportsInsecureLockScreen.

There is no device feature for OEM to config does the device supports
insecure lock screen. Add a new config for OEM to overlay it.

Bug: 129143699
Test: atest on tests need show keyguard

Change-Id: I740a2765502a4d9ac532bb5abb6d0718937874ed
2 files changed