Al Viro pointed out that dma_memcpy_to_kernel_iovec() really was
unreachable and thus unused.  The code originally was there to support
in-kernel dma needs, but since it remains unused, we'll pull it out.
Signed-off-by: NShannon Nelson <shannon.nelson@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>