drm/i915/display: Set I915_BO_ALLOC_USER for fb

Framebuffer is exposed to userspace so make sure we set
proper flags for it. Set I915_BO_PREALLOC for prealloced
fb so that ttm won't clear existing data.

Cc: Matthew Auld <[email protected]>
Cc: Andi Shyti <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Imre Deak <[email protected]>
Signed-off-by: Nirmoy Das <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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