Show battery info for mono audio location device

1. Show mono battery info in LeAudioBluetoothDetailsHeaderController
   without side text in front of the battery icon
2. Show mono side device on Settings > Accessibility > Hearing devices's
   summary without side information

Flag: EXEMPT bugfix
Bug: 379616650
Test: atest AccessibilityHearingAidPreferenceControllerTest
Test: manually check UI with real device
Change-Id: I4a1a3357e2cef51df505923e38da33767c78e8f3