Fix ASHA devices in the same pair name not sync issue

The name of ASHA devices in the same pair is not sync while changing the name from Settings. We should make sure the modification is applied to both devices to avoid UI inconsistencies when main device of the pair is switched.

Bug: 336821241
Test: atest CachedBluetoothDeviceTest#setName_memberDeviceNameIsSet CachedBluetoothDeviceTest#setName_subDeviceNameIsSet HearingAidDeviceManagerTest#setSubDeviceIfNeeded_sameHiSyncId_setSubDevice
Change-Id: Ic016563935d1d180cf70f614e1edf469265366da