backend-drm: Define potentially missing aspect-ratio bit definitions
The aspect ratio definitions for 64:27 and 256:135 have been added with libdrm 2.4.95. However, Weston currently depends on libdrm 2.4.89 or higher. Define the definitions in Weston to support libdrm older than 2.4.95.
Fixes: #332 (closed) Fixes: 6093772f ("backend-drm: Use aspect-ratio bit definitions from libdrm") Signed-off-by: Stefan Agner stefan@agner.ch