Allow overriding disabled changes in final release.

Since disabled changes are disabled by default, our policy should allow
opting in to them in the final release.
Add toString to OverrideAllowedState for easier test debugging.

Test: atest com.android.server.compat.OverrideValidatorImplTest
Bug: 144552011
Change-Id: Iff01ee44d30d3e5703a980cddaf1b38435756c3c
Merged-In: Iff01ee44d30d3e5703a980cddaf1b38435756c3c
4 files changed