Rename exported2_config_prop to systemsound_config_prop

Fixing bad names (exported*_prop) on property contexts.

Bug: 152468650
Test: m sepolicy_tests
Change-Id: Ie98212ee0fa89966e70faa83322b65b613f3b3f5
diff --git a/private/compat/27.0/27.0.ignore.cil b/private/compat/27.0/27.0.ignore.cil
index cb500c9..14fb491 100644
--- a/private/compat/27.0/27.0.ignore.cil
+++ b/private/compat/27.0/27.0.ignore.cil
@@ -152,6 +152,7 @@
     system_bootstrap_lib_file
     system_lmk_prop
     system_update_service
+    systemsound_config_prop
     test_boot_reason_prop
     time_prop
     timedetector_service