Declare dalvik.vm. property and dontaudit explicitly

dex2oat currently uses some properties as flags (see
art/libartbase/base/flags.cc). For CompOS, we don't really need such
properties, and actually should avoid global state. So dontaudit
explicitly.

Bug: 210030607
Test: no more default_prop denials for dex2oat
Change-Id: I10852f2a7df4dac7a9389eab3f53f91328104f96
diff --git a/microdroid/system/private/property.te b/microdroid/system/private/property.te
index 799ac3c..c36875c 100644
--- a/microdroid/system/private/property.te
+++ b/microdroid/system/private/property.te
@@ -1,3 +1,7 @@
+# Declare ART properties for CompOS
+system_public_prop(dalvik_config_prop)
+system_restricted_prop(device_config_runtime_native_prop)
+
 # Don't audit legacy ctl. property handling.  We only want the newer permission check to appear
 # in the audit log
 dontaudit domain {