app/testpmd: fix port id type
app/testpmd: fix port id type

Correct couple port id from uint8_t to uint16_t.

Fixes: f8244c6399d9 ("ethdev: increase port id range")
Cc: stable@dpdk.org

Signed-off-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>
Reviewed-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk