compositor-drm: init linux_dmabuf support
compositor-drm: init linux_dmabuf support

v2 changes:
- only initialize linux_dmabuf if renderer supports it

Signed-off-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>
Reviewed-by: Daniel Stone <62e7e355d5d8400fa8384448796af0bf6be4ffae@collabora.com>

udoprog/weston,xorgy/weston,kwm81/weston,jonnylamb/weston,Tarnyko/weston-xdg_surface_present,Gnurou/weston,Fantu/compositor-spice,krezovic/weston,kwm81/weston,jonnylamb/weston,Gnurou/weston,Fantu/compositor-spice,giucam/weston,sir-murray/weston,udoprog/weston,Tarnyko/weston-xdg_surface_present,xorgy/weston,krezovic/weston,Fantu/compositor-spice,giucam/weston,sir-murray/weston