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/odrefresh.te b/microdroid/system/private/odrefresh.te
index c236637..0acf046 100644
--- a/microdroid/system/private/odrefresh.te
+++ b/microdroid/system/private/odrefresh.te
@@ -37,7 +37,7 @@
 
 # Allow odrefresh to read all dalvik system properties. odrefresh needs to record the relevant ones
 # in the output for later verification check.
-get_prop(odrefresh, dalvik_config_prop)
+get_prop(odrefresh, dalvik_config_prop_type)
 get_prop(odrefresh, device_config_runtime_native_boot_prop)
 
 # Silently ignore the write to properties, e.g. for setting boot animation progress.