drm/tegra: Map cmdbuf once for reloc processing

A few reasons to drop kmap:

- For native objects all we do is look at obj->vaddr anyway, so might
  as well not call functions for every page.

- Reloc-processing on dma-buf is ... questionable.

- Plus most dma-buf that bother kernel cpu mmaps give you at least
  vmap, much less kmaps. And all the ones relevant for arm-soc are
  again doing a obj->vaddr game anyway, there's no real kmap going on
  on arm it seems.

Plus this seems to be the only real in-tree user of dma_buf_kmap, and
I'd like to get rid of that.

Reviewed-by: Thierry Reding <[email protected]>
Tested-by: Thierry Reding <[email protected]>
Acked-by: Sumit Semwal <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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