MFH: r489050 r491609 r492864 r492896 r494747

This merges all changes done to drm-current-kmod, drm-fbsd12.0-kmod and
drm-fbsd11.2-kmod, in order to avoid merge conflicts.

Update pkg-descr to match reality

Update pkg-descr in drm-kmod ports to match reality in terms of which Linux
kernel version they correspond to and which FreeBSD version they are
supporting.

Noticed by: Graham Perrin

graphics/drm-current-kmod: Update messges

Update pkg-message and makefile COMMENT to remove references to
drm-devel-kmod and the mention that this is the development version. It is
the version for FreeBSD CURRENT, so the ride might be a little bumpy, but
it's not the devlopment version.

No changes to package.

FreeBSDDesktop issue: #129

Reported by: grahamperrin
Sponsored by: B3 Init (zeising)

update drm-current and drm-fbsd12.0 snapshots

Update drm-current-kmod and drm-fbsd12.0-kmod to the latest snapshots.
This mutes console chatter about unimplemented stuff, which sometimes is
confusing.

Approved by: jmd (maintainer, implicit)

graphics/drm-fbsd{11.2,12.0}-kmod: Update pkg-message with new names

PR: 235726
Approved by: graphics (jmd)
Differential Revision: https://reviews.freebsd.org/D19189

Update drm kmods for current and FreeBSD 12.0

Update graphics/drm-current-kmod and graphics/drm-fbsd12.0-kmod to their
respective latest snapshots.

This fixes a bug where a non-recursive mutex was used recursively in certain
conditions.
See https://github.com/FreeBSDDesktop/kms-drm/issues/134 for further details

FreeBSDDesktop issue: #134
Approved by: jmd (maintainer, implicit)
Sponsored by: B3 Init

Approved by: ports-secteam (implicit, drm-kmod ports)