FrameworksServicesTests: allow access to test.sys.boot.reason property

com.android.server.power.PowerManagerServiceTest#testGetLastShutdownReasonInternal due to "RuntimeException: failed to set system property"

W/roidJUnitRunner: type=1400 audit(0.0:6): avc: denied { write } for name="property_service" dev="tmpfs" ino=13178 scontext=u:r:platform_app:s0:c512,c768 tcontext=u:object_r:property_socket:s0 tclass=sock_file permissive=0
W/libc    : Unable to set property "test.sys.boot.reason" to "shutdown,thermal": connection failed; errno=13 (Permission denied)

Test: compile
Bug: 78245377
Change-Id: Id21436d281bab27823969a9f7e92318d70b5a2d6

private/compat/26.0/26.0.ignore.cil

@@ -98,6 +98,7 @@
     system_boot_reason_prop
     system_net_netd_hwservice
     system_update_service
+    test_prop
     thermal_service
     thermalcallback_hwservice
     thermalserviced

private/compat/27.0/27.0.ignore.cil

@@ -82,6 +82,7 @@
     storaged_data_file
     system_boot_reason_prop
     system_update_service
+    test_prop
     tombstone_wifi_data_file
     trace_data_file
     traced

private/platform_app.te

@@ -77,6 +77,9 @@ read_runtime_log_tags(platform_app)
 allow platform_app system_server:udp_socket {
         connect getattr read recvfrom sendto write getopt setopt };
 
+# allow platform apps to connect to the property service
+set_prop(platform_app, test_prop)
+
 ###
 ### Neverallow rules
 ###

private/property_contexts

@@ -71,6 +71,7 @@ ro.boot.bootreason      u:object_r:bootloader_boot_reason_prop:s0
 persist.sys.boot.reason u:object_r:last_boot_reason_prop:s0
 sys.boot.reason         u:object_r:system_boot_reason_prop:s0
 pm.                     u:object_r:pm_prop:s0
+test.                   u:object_r:test_prop:s0
 
 # Boolean property set by system server upon boot indicating
 # if device owner is provisioned.

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 test_prop, 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;