graphics/nvidia-drm-*-kmod*: Fix GPF in some configs

Fix General Protection Fault in __nv_drm_gem_nvkms_handle_vma_fault,
lkpi_vmf_insert_pnf_prot_locked, vm_page_busy_acquire in specific
configurations, notably KDE on Wayland.

PR: 296195
Reported by: keivan@motavalli.me
Reviewed by: ashafer
Tested by: keivan@motavalli.me
Differential Revision: https://reviews.freebsd.org/D57989

Co-authored by: ashafer@FreeBSD.org