net/mlx5: reorganize flow handle struct

net/mlx5: reorganize flow handle struct

Currently, the mlx5_flow_handle struct is not fully aligned and has some
bits wasted. The members can be optimized and reorganized to save memory.

1. As metadata and meter is sharing the same flow match id, now the flow
   id is limited to 24 bits due to the 8 MSBs are used as for the meter
   color.  Align the flow id to other bit members to 32 bits to save the
   mlx5 flow handle memory.

2. The vlan_vf in struct mlx5_flow_handle_dv was already moved to struct
   mlx5_flow_handle. Remove the legacy vlan_vf in struct
   mlx5_flow_handle_dv.

3. Reorganize the vlan_vf in mlx5_flow_handle with member SILIST_ENTRY
   next to make it align with 8 bytes.

4. Reorganize the header modify in mlx5_flow_handle_dv to ILIST_ENTRY
   next to make it align to with bytes.

5. Introduce __rte_pack attribute to make the struct tightly organized.

It will totally save 20 bytes memory for mlx5_flow_handle struct.

For the resource objects which are converted to indexed, align the names
with the prefix of rix_.

Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>