drm/vmwgfx: Explicityly track screen target width and height

We can no longer make the assumption that vmw_stdu_update_st() will
be called when there's a valid display surface attached.  So
instead of using display_srf for width and height, make a record of
these paremeters when the screen target is first defined.

Signed-off-by: Sinclair Yeh <[email protected]>
Reviewed-by: Thomas Hellstrom <[email protected]>

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