vfio: Add explicit alignments in vfio_iommu_spapr_tce_create

The vfio_iommu_spapr_tce_create struct has 4x32bit and 2x64bit fields
which should have resulted in sizeof(fio_iommu_spapr_tce_create) equal
to 32 bytes. However due to the gcc's default alignment, the actual
size of this struct is 40 bytes.

This fills gaps with __resv1/2 fields.

This should not cause any change in behavior.

Signed-off-by: Alexey Kardashevskiy <[e-mail]>
Acked-by: David Gibson <[e-mail]>
Signed-off-by: Alex Williamson <[e-mail]>

include/uapi/linux/vfio.h

···
 	__u32 flags;
 	/* in */
 	__u32 page_shift;
+	__u32 __resv1;
 	__u64 window_size;
 	__u32 levels;
+	__u32 __resv2;
 	/* out */
 	__u64 start_addr;
 };