Marvell CN10k mempool supports batch enqueue/dequeue which can
dequeue up to 512 pointers and enqueue up to 15 pointers using
a single instruction.
These batch operations require a DMA memory to enqueue/dequeue
pointers. This patch adds the initialization of this DMA memory.
Signed-off-by: Ashwin Sekhar T K <asekhar@marvell.com>