ioatdma: clean up sed pool kmem_cache

Use a single cache for all sed allocations.  No need to make it per
channel.  This also avoids the slub_debug warnings for multiple caches
with the same name.

Switching to dmam_pool_create() to fix leaking the dma pools on
initialization failure and lets us kill ioat3_dma_remove().

Cc: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --cc drivers/dma/ioat/dma.h
Simple merge

diff --cc drivers/dma/ioat/dma_v2.h
Simple merge

diff --cc drivers/dma/ioat/dma_v3.c
Simple merge

diff --cc drivers/dma/ioat/pci.c
Simple merge