drm/shmem-helpers: Don't call get/put_pages on imported dma-buf in vmap

There's no direct harm, because for the shmem helpers these are noops
on imported buffers. The trouble is in the locks these take - I want
to change dma_buf_vmap locking, and so need to make sure that we only
ever take certain locks on one side of the dma-buf interface: Either
for exporters, or for importers.

v2: Change the control flow less compared to what's there (Thomas)

Tested-by: Boris Brezillon <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Noralf Trønnes <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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