drm/ttm: add drm gem ttm helpers, starting with drm_gem_ttm_print_info()

Now with ttm_buffer_object being a subclass of drm_gem_object we can
easily lookup ttm_buffer_object for a given drm_gem_object, which in
turn allows to create common helper functions.

This patch starts off with a drm_gem_ttm_print_info() helper function
which adds some ttm specific lines to the debug output.

Signed-off-by: Gerd Hoffmann <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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