drm/omapdrm: Drop dma_buf->k(un)map

No in-tree users left.

Note that this is one of the few (if only) implementations of dma-buf
that provided a kmap, but not a vmap implemenation. Given that the
only real user (in-tree at least) of kmap was tegra, and it's
impossible to buy a chip with tegra host1x and ompadrm on the same
SoC, there's no problem here.

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

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