dm: add log for debuging pci while vm reset

Print some log to dmesg when init/deinit vdev.

Tracked-On: #2419
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>

devicemodel/core/vmmapi.c

@@ -409,6 +409,7 @@ vm_get_suspend_mode(void)
 int
 vm_suspend(struct vmctx *ctx, enum vm_suspend_how how)
 {
+	write_kmsg("vm_suspend mode to: %d\n", how);
 	vm_set_suspend_mode(how);
 	mevent_notify();