egl: consistently use dri2_egl_display() helper macro

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6133>
3 files changed