net/mlx5: rebuild flows on updating RETA

Currently mlx5_dev_rss_reta_update() just updates tables in the host,
therefore it isn't immediately effective until restarting the device by
calling mlx5_dev_stop()/mlx5_dev_start() to update the changes in the
device side. This patch adds rebuilding the device-specific data
structure and applying it to the device right away.

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>