Telephony: use FEATURE_TELEPHONY_* instead of config_*_capable

Also, clean up annotations around is(Device)*Capable.

Bug: 353979854
Test: atest CtsTelephonyTestCases:android.telephony.cts.TelephonyManagerTest
Flag: EXEMPT no behavior change as long as device pass CTS
Change-Id: Ibcf8bd206e0e33b3daeca2e5fb18d69ed338149c