xen/gntdev-dmabuf: Ditch dummy map functions

There's no in-kernel users for the k(un)map stuff. And the mmap one is
actively harmful - return 0 and then _not_ actually mmaping can't end
well.

Acked-by: Sumit Semwal <[email protected]>
Reviewed-by: Oleksandr Andrushchenko <[email protected]>
Reviewed-by: Juergen Gross <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Stefano Stabellini <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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