panfrost: Handle AFBC_FEATURES in drm-shim

Fixes the warning with drm-shim:

   Unknown DRM_IOCTL_PANFROST_GET_PARAM 40

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <!13894>
33 jobs for !13894 with drm-shim-afbc in 10 minutes and 13 seconds (queued for 4 seconds)
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