Revert "Add xen_drm to tranditional"

This reverts commit a6408adc9d60ca8f5c0059598b21b95375819507.
Revert "Add drmdev registration"

This reverts commit 0b4f57f13df945e341530868f2fa27bb92c74a51.
Revert "Add initial stub for xen_drm.c"

This reverts commit f2a3d654d7710b4b31b7c80ddfeed8c31e172d50.