IB/core: Remove ib_dma_*map_single_attrs()

Remove these functions because these are not used. Additionally, the
implementation of these functions is not correct for the hfi1, qib and
rxe drivers because dma_device is used instead of dma_ops.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

include/rdma/ib_verbs.h

@@ -3005,24 +3005,6 @@ static inline void ib_dma_unmap_single(struct ib_device *dev,
 		dma_unmap_single(dev->dma_device, addr, size, direction);
 }
 
-static inline u64 ib_dma_map_single_attrs(struct ib_device *dev,
-					  void *cpu_addr, size_t size,
-					  enum dma_data_direction direction,
-					  unsigned long dma_attrs)
-{
-	return dma_map_single_attrs(dev->dma_device, cpu_addr, size,
-				    direction, dma_attrs);
-}
-
-static inline void ib_dma_unmap_single_attrs(struct ib_device *dev,
-					     u64 addr, size_t size,
-					     enum dma_data_direction direction,
-					     unsigned long dma_attrs)
-{
-	return dma_unmap_single_attrs(dev->dma_device, addr, size,
-				      direction, dma_attrs);
-}
-
 /**
  * ib_dma_map_page - Map a physical page to DMA address
  * @dev: The device for which the dma_addr is to be created