drm: Remove defunct dma_buf_kmap stubs

Since commit 09ea0dfbf972 ("dma-buf: make map_atomic and map function
pointers optional"), we no longer need to provide stub no-op functions
as the core now provides them directly.

References: 09ea0dfbf972 ("dma-buf: make map_atomic and map function pointers optional")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: "Christian König" <[email protected]>
Reviewed-by: Christian König <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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