[dpdk-dev] [RFC]lib/ethdev: fix data type in tc_rxq and tc_txq

[humin (Q)]

Currently, base and nb_queue in the tc_rxq and tc_txq information
of queue and TC mapping on both TX and RX paths are uint8_t.
The structure is as follows:

struct rte_eth_dcb_tc_queue_mapping {
     /** rx queues assigned to tc per Pool */
     struct {
         uint8_t base;
         uint8_t nb_queue;
     } tc_rxq[ETH_MAX_VMDQ_POOL][ETH_DCB_NUM_TCS];
     /** rx queues assigned to tc per Pool */
     struct {
         uint8_t base;
         uint8_t nb_queue;
     } tc_txq[ETH_MAX_VMDQ_POOL][ETH_DCB_NUM_TCS];
};

However, these datas will be truncated when queue number under a TC
is greater than 256. So it is necessay for data type of base and
nb_queue to change from uint8_t to uint16_t.