DM: Add option of no check against ptdev reset

With '--ptdev_no_reset', DM doen not abort but warn when assign PCIe
dev without reset capability.

Signed-off-by: Edwin Zhai <edwin.zhai@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>

devicemodel/include/dm.h

@@ -49,4 +49,5 @@ void *paddr_guest2host(struct vmctx *ctx, uintptr_t addr, size_t len);
 void *dm_gpa2hva(uint64_t gpa, size_t size);
 int  virtio_uses_msix(void);
 void ptdev_prefer_msi(bool enable);
+void ptdev_no_reset(bool enable);
 #endif