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/sdk_sandbox.te b/private/sdk_sandbox.te
index cfcf2a4..fc4fce3 100644
--- a/private/sdk_sandbox.te
+++ b/private/sdk_sandbox.te
@@ -42,7 +42,7 @@
     -codec2_config_prop
     -config_prop
     -cppreopt_prop
-    -dalvik_config_prop
+    -dalvik_config_prop_type
     -dalvik_prop
     -dalvik_runtime_prop
     -dck_prop