Hide ro.debuggable and ro.secure from app zygote

Present rule doesn't cover all cases because apps can still
access these props when preloading app_zygote.

Change-Id: I521f1a5f3cb006d3ffad035342a973b6f0d1e914
diff --git a/private/domain.te b/private/domain.te
index d6f86f4..e9cc7f5 100644
--- a/private/domain.te
+++ b/private/domain.te
@@ -501,7 +501,7 @@
 get_prop(domain, surfaceflinger_prop)
 get_prop(domain, telephony_status_prop)
 get_prop(domain, timezone_prop)
-get_prop({domain -untrusted_app_all -isolated_app_all -ephemeral_app },  userdebug_or_eng_prop)
+get_prop({domain -untrusted_app_all -isolated_app_all -ephemeral_app -app_zygote },  userdebug_or_eng_prop)
 get_prop(domain, vendor_socket_hook_prop)
 get_prop(domain, vndk_prop)
 get_prop(domain, vold_status_prop)