v3dv: Enable EXT_swapchain_colorspace

No-op.

Signed-off-by: Joshua Ashton <joshua@froggi.es>
Acked-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Acked-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28275>