MFH: r508969 r508877 r508970 r508971

graphics/drm-devel-kmod: Update snapshot

Fix build on latest CURRENT

Sponsored by: B3 Init

Install kernel module sources for drm-current-kmod.

Install kernel module sources and makefiles to
$PREFIX/sys/modules/drm-current-kmod. This permits kernel builds to
build the DRM modules as part of buildkernel via the LOCAL_MODULES
framework. These modules are installed to the kernel's directory and
are then preferred to the generic modules installed in /boot/modules.

The installation of sources is controlled by a new SOURCES option
which defaults to on.

Reviewed by: zeising, manu
Differential Revision: https://reviews.freebsd.org/D20990

graphics/drm-current-kmod: Update snapshot

Fix build on latest CURRENT

Sponsored by: B3 Init

graphics/drm-devel-kmod: Update snapshot

This contains fixes for upcoming changes to lkpi.

Sponsored by: B3 Init

Approved by: ports-secteam (implicit, drm-drivers blanket)