dm_op: convert HVMOP_set_pci_intx_level, HVMOP_set_isa_irq_level, and...

dm_op: convert HVMOP_set_pci_intx_level, HVMOP_set_isa_irq_level, and...

... HVMOP_set_pci_link_route

These HVMOPs were exposed to guests so their definitions need to be
preserved for compatibility. This patch therefore updates
__XEN_LATEST_INTERFACE_VERSION__ to 0x00040900 and makes the HVMOP
defintions conditional on __XEN_INTERFACE_VERSION__ less than that value.

NOTE: This patch also widens the 'domain' parameter of
      xc_hvm_set_pci_intx_level() from a uint8_t to a uint16_t.

Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>