Fix MainSwitchPreference

This change simplifies MainSwitchPreference widget significantly and fix
some issues:

- Override setTitle/setSummary/etc to update UI is incorrect.
  Under the hood, notifyChange will be invoked when any change is
  detected and onBindViewHolder is triggered. All the UI binding logic
  must be done within onBindViewHolder.
- The listener is added to MainSwitchBar but never be removed, which
  will cause weird issue (e.g. ag/3645453) when view holder is reused.

Bug: 391092187
Flag: EXEMPT library
Test: atest&manual
Change-Id: I4fc5ad382253c7dade1165487142078e56164941