backend/drm: skip reset after VT switch if possible

If all connectors and planes already have the right CRTC set, or
are disabled, we can skip the device-wide reset after a VT switch.

I've contemplated using a more fine-grained logic to only reset
the connectors, CRTCs and planes that need to be migrated. However,
writing a correct algorithm for this would be quite involved, and it
doesn't seem worth the trouble anyways.

Closes: https://github.com/swaywm/sway/issues/7956

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