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/property_contexts b/private/property_contexts
index 5baaf9d..cd6a4b0 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -381,11 +381,12 @@
 ro.com.android.dataroaming     u:object_r:exported3_default_prop:s0 exact bool
 ro.com.android.prov_mobiledata u:object_r:exported3_default_prop:s0 exact bool
 
-ro.config.alarm_alert        u:object_r:exported2_config_prop:s0 exact string
-ro.config.media_vol_steps    u:object_r:exported2_config_prop:s0 exact int
-ro.config.notification_sound u:object_r:exported2_config_prop:s0 exact string
-ro.config.per_app_memcg      u:object_r:exported3_default_prop:s0 exact bool
-ro.config.ringtone           u:object_r:exported2_config_prop:s0 exact string
+ro.config.alarm_alert        u:object_r:systemsound_config_prop:s0 exact string
+ro.config.media_vol_steps    u:object_r:systemsound_config_prop:s0 exact int
+ro.config.notification_sound u:object_r:systemsound_config_prop:s0 exact string
+ro.config.ringtone           u:object_r:systemsound_config_prop:s0 exact string
+
+ro.config.per_app_memcg u:object_r:exported3_default_prop:s0 exact bool
 
 ro.control_privapp_permissions u:object_r:exported3_default_prop:s0 exact string