egl/wayland: Add format enums to visual map

egl/wayland: Add format enums to visual map

Extend the visual map from only containing names and bitmasks, to also
carrying the three format enums we need. These are the DRIImage format
tokens for internal allocation, FourCC codes for wl_drm and dmabuf
protocol, and wl_shm codes for swrast drivers.

We will later use these formats to eliminate a bunch of open-coded
conversions.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Ilia Mirkin <imirkin@alum.mit.edu>