Don't notify display removed if it's a private virtual display

Some operation will be done When displays are removed/Added,
but virtual private display should be excluded.

Bug: 148760652
Test: manual test:1.Enable the magnification from a11y setting
2. Enable the select to speak and read text on images
3.Tap the a11y shortcut to select to speak the content
4. check if the content is selected correctly.
Change-Id: I8e0fbc4da7cbb6b9c5bf5366115b3863be5243bb