Shows LE audio hearing aid device in a11y settings page (2/3)

Handles LE audio hearing aid in CachedBluetoothDevice. Previously
isHearingAidDevice() will only consider ASHA hearing aid, and now it
takes LE audio hearing aid into consideration as well.

Bug: 249235823
Test: make RunSettingsLibRoboTests ROBOTEST_FILTER=CachedBluetoothDeviceTest
Change-Id: I9c50a7b759b7fbcd80f1f5706909ce0a6ddc5959