x86/dmop: add compat struct checking for XEN_DMOP_map_mem_type_to_ioreq_server

x86/dmop: add compat struct checking for XEN_DMOP_map_mem_type_to_ioreq_server

This was forgotten when the subop was added.

Also take the opportunity and move the dm_op_relocate_memory entry in
xlat.lst to its designated place.

No change in the resulting generated code.

Fixes: ca2b511d3ff4 ("x86/ioreq server: add DMOP to map guest ram with p2m_ioreq_server to an ioreq server")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>