u_gralloc: Add support for gbm_gralloc

Although gbm_gralloc has not been maintained for a long time, it is still
used in android-x86, BlissOS and WayDroid. Let's add support so that
x86 drivers no longer need to request tiling flags from the kernel.

Acked-by: Chia-I Wu <olvaffe@gmail.com>
Acked-by: David Heidelberg <david.heidelberg@collabora.com>
Tested-by: HMTheBoy154 <buingoc67@gmail.com>  # BlissOS 15 & Mesa 23.3.2
Tested-by: Mauro Rossi <issor.oruam@gmail.com>  # android-x86 for mesa 24.0.0-devel on Skylake GT2
Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25380>

src/util/u_gralloc/u_gralloc.c

@@ -28,6 +28,7 @@ static const struct u_grallocs {
 #ifdef USE_IMAPPER4_METADATA_API
    {.type = U_GRALLOC_TYPE_GRALLOC4, .create = u_gralloc_imapper_api_create},
 #endif /* USE_IMAPPER4_METADATA_API */
+   {.type = U_GRALLOC_TYPE_LIBDRM, .create = u_gralloc_libdrm_create},
    {.type = U_GRALLOC_TYPE_QCOM, .create = u_gralloc_qcom_create},
    {.type = U_GRALLOC_TYPE_FALLBACK, .create = u_gralloc_fallback_create},
 };