Remove DeviceConfig dependency.

Remove dependency on writing and reading values to and from DeviceConfig
and just use the local DeviceConfig.Properties object instead.

Bug: 255679453
Test: atest FrameworksServicesTests:WorkTypeConfigTest
Change-Id: If904b0dc89ea60edbf1de3a6d8cda14a38343cfa
(cherry picked from commit 3b9e9d28)