Allow system_server and shell to start gsid on-demand.

gsid is started lazily to reduce memory pressure. It can be started
either via gsi_tool (invoked by adb shell), or by DynamicAndroidService
via system_server.

Bug: 126622385
Test: no denials running "gsi_tool status"
Change-Id: I90a5f3f28fe4f294fb60e7c87a62e76716fbd5c0
diff --git a/private/property_contexts b/private/property_contexts
index a34a52c..b3214c8 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -127,6 +127,11 @@
 ctl.stop$adbd              u:object_r:ctl_adbd_prop:s0
 ctl.restart$adbd           u:object_r:ctl_adbd_prop:s0
 
+# Restrict access to starting/stopping gsid.
+ctl.start$gsid          u:object_r:ctl_gsid_prop:s0
+ctl.stop$gsid           u:object_r:ctl_gsid_prop:s0
+ctl.restart$gsid        u:object_r:ctl_gsid_prop:s0
+
 # NFC properties
 nfc.                    u:object_r:nfc_prop:s0