Remove REQUEST_NOT_SUPPORTED from IRadio

Existing APIs should not allow REQUEST_NOT_SUPPORTED as a valid
error. VTS will be updated next to enforce this behavior.
Deprecate unused APIs and remove REQUEST_NOT_SUPPORTED. Deprecated APIs
will not be tested through VTS.

Test: atest hal_implementation_test
Bug: 254095902
Change-Id: I75861eaf632f624afd5fbee2acffb1dd5c5dde27