eventdev/rxa: fix integer truncation in eth_dev_id validation

[wapxmas]

eth_dev_id is declared as int in handle_rxa_get_queue_conf,
handle_rxa_get_queue_stats, handle_rxa_queue_stats_reset, and
handle_rxa_instance_get, but is implicitly narrowed to uint16_t when
passed to rte_eth_dev_is_valid_port via
RTE_EVENT_ETH_RX_ADAPTER_PORTID_VALID_OR_GOTO_ERR_RET. This means
a value like 65535 + N passes validation as N, but is used as-is as
an array index, causing an out-of-bounds access and SIGSEGV.

To reproduce (requires telemetry enabled):

echo "/eventdev/rxa_queue_conf,0,65536,0" | \
  socat - UNIX-CONNECT:/var/run/dpdk/vpp/dpdk_telemetry.v2,type=5

Result:

SIGSEGV at handle_rxa_get_queue_conf + 0x34a, faulting address 0x50

Fix: Change eth_dev_id type from int to uint16_t.