packing the internal substructures will reduce the overall alignment of
`sockaddr_storage` to 2, which triggers an unaligned access warning
in 32-bit systems.
Add an overall 8-byte alignment to the outermost layer of the structure.
Related commit: 855336bf
Refer to https://datatracker.ietf.org/doc/html/rfc2553#section-3.10
Signed-off-by: nuttxs <zhaoqing.zhang@sony.com>