RadioOnHelper was moved to fw/opt/tele so clean up redundancies

Clean up the redundant RadioOnHelper/RadioOnStateListener code that
was copied over to fw/opt/tele so we do not diverge impls.

Fixes: b/261512285
Test: build; presubmit; manual flash & call tests
Change-Id: I60c5801abcf24dfbfb605f6879f5344ba4bfa201
5 files changed