Show message when no preset info is obtained from the remote device

Display message when hearing aid has no presets configured. Previously, the preset item was grayed out with no explanation, causing confusion. Now, a clear message informs users that presets are not available on their device.

Bug: 345112286
Test: atest BluetoothDetailsHearingAidsPresetsControllerTest
Flag: EXEMPT bugfix
Change-Id: Ie1ece8f08933eb28a5947e2a030888a6bc49bc9f