When the port restarts, the flow ctrl register will be reset,
we need to make sure it can be configured the same as previous setting,
otherwise a register read error would occur. This patch fixes this
issue.
Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org
Signed-off-by: Guinan Sun <guinanx.sun@intel.com>
Tested-by: Tomasz Konieczny <tomaszx.konieczny@intel.com>
Reviewed-by: Xiaolong Ye <xiaolong.ye@intel.com>