Pass display owner uid explicitly for virtual displays.

This allows for creating a display with clean identity on behalf of
an app, prerequisite for virtual devices managed in the system server

Also, remove the ACCESS_COMPUTER_CONTROL permission checks that allow
for creating trusted and always unlocked displays. These are no longer
needed when the display is created with a clean identity

Bug: 432679227
Test: presubmit
Flag: EXEMPT no-op
Change-Id: I614d8ebe26993d8aee78b7b334fd002e43b75cab