Fix to poll some specific registers, which expect bit value 0.
'w32w' is used in registers where the write command bit is set and
waits for the bit clear to complete the write.
Fixes: 24a4c76aff4d ("net/txgbe: add error types and registers")
Cc: stable@dpdk.org
Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
aa08f3eb4e