vfio: trivially use __aligned_u64 for ioctl structs

u64 alignment behaves differently depending on the architecture and so
<uapi/linux/types.h> offers __aligned_u64 to achieve consistent behavior
in kernel<->userspace ABIs.

There are structs in <uapi/linux/vfio.h> that can trivially be updated
to __aligned_u64 because the struct sizes are multiples of 8 bytes.
There is no change in memory layout on any CPU architecture and
therefore this change is safe.

The commits that follow this one handle the trickier cases where
explanation about ABI breakage is necessary.

Suggested-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Stefan Hajnoczi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

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