egl/wayland: for prime, allocate linear_copy from display GPU VRAM

egl/wayland: for prime, allocate linear_copy from display GPU VRAM

Allocates VRAM in display GPU in case of prime. Then the dma_buf is imported
into prime GPU.

v4: add image tag to __DRIimage (Marek Olšák)
v3: move display fd opening to separate commit (Pierre-Eric)
    image_format_to_fourcc() non-static to seperate commit (Pierre-Eric)
v2: close query fds after linear_copy buffer import (Marek Olšák)
    use image_format_to_fourcc() from loader_dri3_helper.c (Marek Olšák)

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>