drmkpi: Hook slab to the build

Author: evadot

extra_patches/files

@@ -76,6 +76,7 @@ dev/drm/drmkpi/drmkpi_page1.c			optional compat_drmkpi compile-with "${DRM_C}"
 dev/drm/drmkpi/drmkpi_rcu.c			optional compat_drmkpi compile-with "${DRM_C}"
 dev/drm/drmkpi/drmkpi_reservation.c		optional compat_drmkpi compile-with "${DRM_C}"
 dev/drm/drmkpi/drmkpi_schedule.c		optional compat_drmkpi compile-with "${DRM_C}"
+dev/drm/drmkpi/drmkpi_slab.c			optional compat_drmkpi compile-with "${DRM_C}"
 dev/drm/drmkpi/drmkpi_sync_file.c		optional compat_drmkpi compile-with "${DRM_C}"
 dev/drm/drmkpi/drmkpi_timer.c			optional compat_drmkpi compile-with "${DRM_C}"
 dev/drm/drmkpi/drmkpi_work.c			optional compat_drmkpi compile-with "${DRM_C}"