drm: Store a pointer to drm_format_info under drm_framebuffer

To avoid having to look up the format information struct every time,
let's just store a pointer to it under drm_framebuffer.

v2: Don't populate the fb->format pointer in drm_framebuffer_init().
    instead we'll treat a NULL format as an error later

Cc: Laurent Pinchart <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Alex Deucher <[email protected]> (v1)
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Laurent Pinchart <[email protected]>

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