Fix basic broadcastradio HAL 1.1/2.0 functionality.

This change fixes a few minor gaps preventing the reference radio app
from accessing HAL 1.1 and 2.0 devices:
- createAmFmSelector not detecting the radio band
- don't allow configuration-dependant operations before the configuration
  is applied
- allow the initial configuration to be auto-selected

Bug: 74353024
Test: manual
Change-Id: If47872c1bf4cf57c6c39715218d90df9701c372d