Migrate existing policies to the policy engine

Migrated policies that are stored in DPMS only

Fixes: 258811766
Bug: 273494642
Test: btest a.d.c.UserControlDisabledPackagesTest#setUserControlDisabledPackages_policyMigration_works*
Test: btest a.d.c.PermitInputMethodsTest#setPermittedInputMethods_policyMigration_works*
Test: btest a.d.c.AccountManagementTest#setAccountManagementDisabled_policyMigration_works*
Test: btest a.d.c.ScreenCaptureDisabledTest#setScreenCaptureDisabled_policyMigration_works*
Change-Id: I320ba9a56e66ce2bf1833ff6e33b1c3d9e36013e
Merged-In: I320ba9a56e66ce2bf1833ff6e33b1c3d9e36013e