egl: add fd_display_gpu to struct dri2_egl_display

fd opened on display gpu is saved in fd_display_gpu. It is later used
to create dri screen on display gpu.

Signed-off-by: Yogesh Mohanmarimuthu <yogesh.mohanmarimuthu@amd.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13422>
7 files changed