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/private/property.te b/private/property.te
index 9e49c30..2de1af5 100644
--- a/private/property.te
+++ b/private/property.te
@@ -275,7 +275,7 @@
     -vendor_init
   } {
     core_property_type
-    dalvik_config_prop
+    dalvik_config_prop_type
     extended_core_property_type
     exported3_system_prop
     systemsound_config_prop