Add hypervisor.virtmgr.dump_device_tree

Add property for trigger input DT dumping from virtmgr/crosvm.

Test: -
Bug: 335160369
Change-Id: I4b29d123e3beaad1d43b2cf9257975ba98c0f78a
diff --git a/private/property_contexts b/private/property_contexts
index 2fbb046..6d6fab9 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -741,6 +741,7 @@
 
 hypervisor.pvmfw.path                              u:object_r:hypervisor_pvmfw_prop:s0 exact string
 hypervisor.virtualizationmanager.debug_policy.path u:object_r:hypervisor_virtualizationmanager_prop:s0 exact string
+hypervisor.virtualizationmanager.dump_device_tree u:object_r:hypervisor_virtualizationmanager_prop:s0 exact bool
 
 # hypervisor.*: configured by the vendor to advertise capabilities of their
 # hypervisor to virtualizationservice.