multidisplay: call surfaceflinger to set display

The resizable emulator needs to change display frequently,
and multidisplay is enhanced to do that.

This cl adds "SET_DISPLAY" command to multidisplay and
calls surfaceflinger to do that.

necessary permissions are added to achieve this.

Bug: 308443736

Change-Id: I1c0c54eb152d26a79a91115a826c64131da1bb5e
5 files changed