graphics/drm-next-kmod: update DRM/KMS to Linux 4.11 level for recent CURRENT and 11-STABLE.

This was tested with CURRENT on:

• Haswell
• Broadwell
• Skylake
• Evergreen
• Kaveri (both radeon and amgpu KMS)
• Carrizo
• Polaris

Thanks to Johannes Lundberg and Hans Petter Selasky for their heroic efforts!

Reviewed by: swills (mentor), rene (mentor)
Approved by: swills (mentor), rene (mentor)
Obtained from: FreeBSDDesktop
Differential Revision: https://reviews.freebsd.org/D14496