Sepolicy for mm_events

Allow mm_events to periodically arm the mm_events
perfetto trace config if mm_events is enabled.

Bug: 183037386
Test: boot; setprop persist.mm_events.enabled true; No avc denials
Change-Id: Ia9760001e7fb591f18e3e816a63281167a658c74
diff --git a/private/property_contexts b/private/property_contexts
index 6a00538..5e4620f 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -241,6 +241,9 @@
 persist.device_config.swcodec_native.               u:object_r:device_config_swcodec_native_prop:s0
 persist.device_config.window_manager_native_boot.   u:object_r:device_config_window_manager_native_boot_prop:s0
 
+# MM Events config props
+persist.mm_events.enabled                           u:object_r:mm_events_config_prop:s0 exact bool
+
 # Properties that relate to legacy server configurable flags
 persist.device_config.global_settings.sys_traced u:object_r:device_config_sys_traced_prop:s0