net/qede: refactoring multi-queue implementation

net/qede: refactoring multi-queue implementation

This patch does the following refactoring and cleanup:

- As part of multi-queue support a struct member called 'type' was added
  in struct qede_fastpath in order to identify whether a queue is RX or
  TX and take actions based on that. This was unnecessary in the first
  place since pointers to RX and TX queues are already available in
  rte_eth_dev->data. So all usage of fp->type is removed.

- Remove remaining additional layer of internal callbacks for RX/TX
  queues and fastpath related operations from the qed_eth_ops_pass.
  With this change the files qede_eth_if.[c,h] are no longer needed.

- Add new per-queue start/stop APIs instead of clubbing it all together.

- Remove multiple TXQs references (num_tc and fp->txqs) since CoS is not
  supported.

- Enable sharing of the status block for each queue pair.

- Remove enum qede_dev_state and instead make use of existing port
  states RTE_ETH_QUEUE_STATE_STOPPED/RTE_ETH_QUEUE_STATE_STARTED.

- Move qede_dev_start() and qede_dev_stop() to qede_ethdev.c from
  qede_rxtc.c.

Signed-off-by: Harish Patil <harish.patil@cavium.com>