system_server: make UnlockedDeviceRequired fix unconditional

Make the fix unconditional and remove all superseded code.

Bug: 299298338
Test: atest -p --include-subdirs system/security/keystore2
Test: atest CtsKeystoreTestCases
Test: atest com.android.server.locksettings
Test: atest TrustManagerServiceTest
Test: atest TrustTests
Change-Id: I78dd3268b2b98873a4020a9b6fe0348e935eb5aa