bt-test-utils-lib: Handle UiAutomation.ALL_PERMISSIONS

* getAdoptedShellPermissions() will return ALL_PERMISSIONS instead of
  null or empty array when all permissions are adopted
* This needs to be handled specially in our code

Test: atest BumbleBluetoothTests
Bug: 300052980
Change-Id: I0385b44c00ba6db9d461b660bddd6685a3a9f2a1