make ro.persistent_properties.ready accessible for hidl client

 - compared to ro.boottime, this one does not pass time info

bug: 35178781
bug: 34274385
Test: reboot

Change-Id: I6a7bf636a3f201653e2890751d5fa210274c9ede

private/property_contexts

@@ -84,6 +84,8 @@ ro.crypto.              u:object_r:vold_prop:s0
 # set at runtime by system_server.
 ro.build.fingerprint    u:object_r:fingerprint_prop:s0
 
+ro.persistent_properties.ready  u:object_r:persistent_properties_ready_prop:s0
+
 # ctl properties
 ctl.bootanim            u:object_r:ctl_bootanim_prop:s0
 ctl.dumpstate           u:object_r:ctl_dumpstate_prop:s0

public/property.te

@@ -34,6 +34,7 @@ type nfc_prop, property_type, core_property_type;
 type overlay_prop, property_type;
 type pan_result_prop, property_type, core_property_type;
 type persist_debug_prop, property_type, core_property_type;
+type persistent_properties_ready_prop, property_type;
 type powerctl_prop, property_type, core_property_type;
 type radio_prop, property_type, core_property_type;
 type restorecon_prop, property_type, core_property_type;

public/te_macros

@@ -291,7 +291,7 @@ allow hwservicemanager $1:process getattr;
 # stability). getService must also check for data to be mounted
 # if the vintf promises the hal will be registered over hwbinder.
 get_prop($1, hal_binderization_prop)
-get_prop($1, boottime_prop)
+get_prop($1, persistent_properties_ready_prop)
 get_prop($1, vold_prop)
 # rw access to /dev/hwbinder and /dev/ashmem is presently granted to
 # all domains in domain.te.