vulkan/wsi/wayland: improve same gpu detection

vulkan/wsi/wayland: improve same gpu detection

Some compositor like KWin do not return the render node.

v2: Make sure we test if only drm_info.hasPrimary is true (Jason)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: db42ed1e04 ("vulkan/wsi/wl: correctly find whether the compositor uses the same GPU")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8139
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20914>
(cherry picked from commit e27d217fb16be3d72bc07822cd499ac78f8cc110)