Allow vndservicemanager to self-register.

This is useful for tools like dumpsys, so that they work on all services
equally as well. Also, so that there is no difference with the regular
service manager.

Bug: 150579832
Test: 'adb shell /vendor/bin/dumpsys -l' shows 'manager'
Test: denial is no longer present:
03-05 12:23:47.346   221   221 E SELinux : avc:  denied  { add } for pid=221 uid=1000 name=manager scontext=u:r:vndservicemanager:s0 tcontext=u:object_r:service_manager_vndservice:s0 tclass=service_manager permissive=0

Change-Id: Id6126e8277462a2c4d5f6022ab67a4bacaa3241e

private/compat/29.0/29.0.ignore.cil

@@ -82,6 +82,7 @@
     art_apex_dir
     rebootescrow_hal_prop
     service_manager_service
+    service_manager_vndservice
     simpleperf
     snapshotctl_log_data_file
     socket_hook_prop
@@ -111,4 +112,5 @@
     vendor_install_recovery
     vendor_install_recovery_exec
     vendor_socket_hook_prop
+    vendor_socket_hook_prop
     virtual_ab_prop))

public/vndservice.te

@@ -1 +1,2 @@
+type service_manager_vndservice, vndservice_manager_type;
 type default_android_vndservice, vndservice_manager_type;

vendor/vndservice_contexts

@@ -1 +1,2 @@
+manager                 u:object_r:service_manager_vndservice:s0
 *                       u:object_r:default_android_vndservice:s0

vendor/vndservicemanager.te

@@ -13,6 +13,8 @@ allow vndservicemanager vndbinder_device:chr_file rw_file_perms;
 # Read vndservice_contexts
 allow vndservicemanager vndservice_contexts_file:file r_file_perms;
 
+add_service(vndservicemanager, service_manager_vndservice)
+
 # Start lazy services
 set_prop(vndservicemanager, ctl_interface_start_prop)