drm/vmwgfx: Don't look at state->allow_modeset

That's purely for the uapi layer to implement the ALLOW_MODESET flag.

Drivers should instead look at the state, e.g. through
drm_atomic_crtc_needs_modeset(), which vmwgfx already does. Also remove
the confusing comment, since checking allow_modeset is at best a micro
optimization.

v2: Rebase

Reviewed-by: Deepak Rawat <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: VMware Graphics <[email protected]>
Cc: Thomas Hellstrom <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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