graphics/drm-next-kmod and graphics/gpu-firmware-kmod: after MFC'ing the relevant parts of the linuxkpi to 11-STABLE by hps allows us to now support the Linux-based KMS bits there. Adjust the OSVERSION check accordingly.

Reviewed by: swills (mentor)
Approved by: swills (mentor)
Obtained from: FreeBSDDesktop / hps
Differential Revision: https://reviews.freebsd.org/D14424