nouveau: import libdrm_nouveau

Most of the code is copied as is, but there are a couple of changes:
- drop pre nvif code
- nouveau_list -> list_head
- pthread_mutex_t -> simple_mtx_t
- nvif_unwrap removed
- no assignments in if statements
- nouveau_object_mthd -> nouveau_device_info
- reworked object allocation UAPI calls

Most of the reworked code was copied from NVK or a previous version of it

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Acked-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27853>

meson.build

@@ -1633,12 +1633,10 @@ endif
 # bar are both on use 2.4.3 for both of them
 dep_libdrm_amdgpu = null_dep
 dep_libdrm_radeon = null_dep
-dep_libdrm_nouveau = null_dep
 dep_libdrm_intel = null_dep
 
 _drm_amdgpu_ver = '2.4.119'
 _drm_radeon_ver = '2.4.71'
-_drm_nouveau_ver = '2.4.102'
 _drm_intel_ver = '2.4.75'
 _drm_ver = '2.4.109'
 
@@ -1646,7 +1644,6 @@ _libdrm_checks = [
   ['intel', with_gallium_i915],
   ['amdgpu', (with_amd_vk and not with_platform_windows) or with_gallium_radeonsi],
   ['radeon', (with_gallium_radeonsi or with_gallium_r300 or with_gallium_r600)],
-  ['nouveau', with_any_nouveau],
 ]
 
 # Loop over the enables versions and get the highest libdrm requirement for all