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Per discussions on arch@ and elsewhere, retire drm module / drives.

Description

Per discussions on arch@ and elsewhere, retire drm module / drives.

Retire the drm modules / drivers. These are now handled by the
drm-legacy-kmod port and/or the drm-kmod port. All future
development and maintanace will be handled there.

Approved by: graphics team
Reviewed by: manu@, mmel@
Differential Revision: https://reviews.freebsd.org/D19196