Don't use Lambda when register callback

This CL before, the lambda callback is different it cause
callback didn't unregister.
If you re-enter bluetooth detail page many times,
onDeviceAttributesChanged() will be called many times cause UI not
smooth.

This CL remove the lambda callback and show the UI when device
connected.

Fixes: 141583252
Test: Manual
Change-Id: Icd3e84b2d461d9b949f080269dfa2bb5b5d5cb73