vulkan/wsi/wayland: switch from alpha/opaque bools to bitfield
This makes the numerous wsi_wl_display_add_vk_format calls easier
to follow: "ALPHA" is easier to decode than "true, false".
No functional changes, just refactoring.
Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14874>