Allow system server to set dynamic ART properties.

This change gives a new type (dalvik_dynamic_config_prop) to some ART
properties such as dalvik.vm.dex2oat-cpu-set and adds a new rule to
allow system server to set them.

Bug: 274530433
Test: Locally added some code to set those properties and saw it being
  successfull.
Change-Id: Ie28602e9039b7647656594ce5c184d29778fa089
diff --git a/microdroid/system/private/compos.te b/microdroid/system/private/compos.te
index f4bb79b..6dd97d0 100644
--- a/microdroid/system/private/compos.te
+++ b/microdroid/system/private/compos.te
@@ -11,7 +11,7 @@
 dontaudit compos self:global_capability_class_set dac_override;
 
 # Allow settings system properties that ART expects.
-set_prop(compos, dalvik_config_prop)
+set_prop(compos, dalvik_config_prop_type)
 set_prop(compos, device_config_runtime_native_boot_prop)
 
 # Allow running odrefresh in its own domain