[Hearing device shortcut] Setup shortcut for hearing device

* Hearing aids page need to set restricted mode to DISALLOW_CONFIG_BLUETOOTH, so change AccessibilityShortcutPreferenceFragment to extend RestrictedDashboardFragment
* move ShortcutPreference under the device control category for the 1st order

Bug: 237625815
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AccessibilityShortcutPreferenceFragmentTest
Change-Id: I13da8d979694aeab76d8a10edf1348c0ee7810f6