sfc: fix field-spanning memcpy in selftest

sfc: fix field-spanning memcpy in selftest

Add a struct_group for the whole packet body so we can copy it in one
 go without triggering FORTIFY_SOURCE complaints.

Fixes: cf60ed469629 ("sfc: use padding to fix alignment in loopback test")
Fixes: 30c24dd87f3f ("sfc: siena: use padding to fix alignment in loopback test")
Fixes: 1186c6b31ee1 ("sfc: falcon: use padding to fix alignment in loopback test")
Reviewed-by: Andy Moreton <[email protected]>
Tested-by: Andy Moreton <[email protected]>
Signed-off-by: Edward Cree <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>