Return UNSUPPORTED_ON_DEVICE in network/eid when no telephony

If the device does not have any telephony support (either via the
build-time config_show_sim_info=false boolean flag, or when not
declaring the PackageManager.FEATURE_TELEPHONY_DATA feature flag),
returning UNSUPPORTED_ON_DEVICE makes more sense than
CONDITIONALLY_UNAVAILABLE, as there is no runtime change that would
make it available.

Bug: 395714454
Test: atest MobileNetworkEidPreferenceControllerTest
Flag: EXEMPT bugfix

Change-Id: Id6418956629c5ef26c463226eaa6cfa947d4dbbc