dm: adapt mptable generation for VM with lapic pt

- don't generate io apic entry for vm with lapic pt.

Tracked-On: #2351
Signed-off-by: Yan, Like <like.yan@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

devicemodel/core/main.c

@@ -88,6 +88,7 @@ char *elf_file_name;
 uint8_t trusty_enabled;
 char *mac_seed;
 bool stdio_in_use;
+bool lapic_pt;
 
 static int virtio_msix = 1;
 static bool debugexit_enabled;