density: do not apply to virtual displays

Check the incoming configuration density to ensure that it is the same
as the device's default density before forcing preferred values.

Only apply display metrics if the display is not a presentation.

Ref: CYNGNOS-338
Change-Id: I437ac8cf45f1a6c568707e0733364b2495791d8a
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit a5c551df)