sepolicy: allow shell to read/write traced prop

This is to fix the CTS failures given by the bugs below where devices
where traced is not enabled by default causes test failures.

Bug: 78215159
Bug: 78347829
Change-Id: Ib0f6a1cdb770528dbbeb857368534ff5040e464e

private/compat/26.0/26.0.ignore.cil

@@ -108,6 +108,7 @@
     traceur_app_tmpfs
     traced
     traced_consumer_socket
+    traced_enabled_prop
     traced_exec
     traced_probes
     traced_probes_exec

private/compat/27.0/27.0.ignore.cil

@@ -83,6 +83,7 @@
     trace_data_file
     traced
     traced_consumer_socket
+    traced_enabled_prop
     traced_exec
     traced_probes
     traced_probes_exec

private/property_contexts

@@ -59,6 +59,7 @@ persist.sys.audit_safemode      u:object_r:safemode_prop:s0
 persist.service.        u:object_r:system_prop:s0
 persist.service.bdroid. u:object_r:bluetooth_prop:s0
 persist.security.       u:object_r:system_prop:s0
+persist.traced.enable   u:object_r:traced_enabled_prop:s0
 persist.vendor.overlay.  u:object_r:overlay_prop:s0
 ro.boot.vendor.overlay.  u:object_r:overlay_prop:s0
 ro.boottime.             u:object_r:boottime_prop:s0

public/property.te

@@ -51,6 +51,7 @@ type shell_prop, property_type, core_property_type;
 type system_boot_reason_prop, property_type;
 type system_prop, property_type, core_property_type;
 type system_radio_prop, property_type, core_property_type;
+type traced_enabled_prop, property_type;
 type vold_prop, property_type, core_property_type;
 type wifi_log_prop, property_type, log_property_type;
 type wifi_prop, property_type;

public/shell.te

@@ -66,6 +66,9 @@ set_prop(shell, debug_prop)
 set_prop(shell, powerctl_prop)
 set_prop(shell, log_tag_prop)
 set_prop(shell, wifi_log_prop)
+# Allow shell to start/stop traced via the persist.traced.enable
+# property (which also takes care of /data/misc initialization).
+set_prop(shell, traced_enabled_prop)
 # adjust is_loggable properties
 userdebug_or_eng(`set_prop(shell, log_prop)')
 # logpersist script