drm/prime: reject DMA-BUF attach when get_sg_table is missing

drm_gem_map_dma_buf() requires drm_gem_object_funcs.get_sg_table
to be implemented, or else WARNs.

Allow drivers to leave this hook unimplemented to implement purely
local DMA-BUFs (ie, DMA-BUFs which cannot be imported anywhere
else but the device which allocated them). In that case, reject
imports to other devices in drm_gem_map_attach().

v2: new patch

v3: use ENOSYS

Signed-off-by: Simon Ser <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Tian Tao <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Hans de Goede <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Christian König <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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