drm: Move simple_display_pipe prepare_fb helper into gem fb helpers

There's nothing tinydrm specific to this, and there's a few more
copies of the same in various other drivers.

Signed-off-by: Daniel Vetter <[email protected]>
Cc: Gustavo Padovan <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: David Airlie <[email protected]>
Cc: David Lechner <[email protected]>
Cc: "Noralf Trønnes" <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Daniel Stone <[email protected]>
Cc: Haneen Mohammed <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: "Ville Syrjälä" <[email protected]>
Reviewed-by: Oleksandr Andrushchenko <[email protected]>
Acked-by: David Lechner <[email protected]>
Reviewed-by: Noralf Trønnes <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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