drm/vram: Implement lazy unmapping for GEM VRAM buffers

Frequent mapping and unmapping a buffer object adds overhead for
modifying the page table and creates debug output. Unmapping a buffer
is only required when the memory manager evicts the buffer from its
current location.

v4:
	* WARN_ON if buffer is still mapped during BO cleanup

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Gerd Hoffmann <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Reported-and-tested-by: Davidlohr Bueso <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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