Remove TimeController constants.

The only flag in TimeController constants is no longer needed, so we
don't need the constants infrastructure here. Any new constants we need
can make use of the DeviceConfig infrastructure we're adding.

Bug: 124466289
Bug: 141645789
Test: atest com.android.server.job.controllers.TimeControllerTest
Test: atest CtsJobSchedulerTestCases
Test: atest SettingsProviderTest:SettingsBackupTest
Change-Id: I15e99617a8afee446839a4212377aa5543776422