Remove access to /proc/net/{tcp,udp}

Remove these files from proc_net_type. Domains that need access must
have permission explicitly granted. Neverallow app access except the
shell domain.

Bug: 114475727
Test: atest CtsLibcoreOjTestCases
Test: netstat, lsof
Test: adb bugreport
Change-Id: I2304e3e98c0d637af78a361569466aa2fbe79fa0
diff --git a/private/dumpstate.te b/private/dumpstate.te
index b3db3d4..d1fbacc 100644
--- a/private/dumpstate.te
+++ b/private/dumpstate.te
@@ -42,3 +42,4 @@
 allow dumpstate webview_zygote:process signal;
 dontaudit dumpstate perfprofd:binder call;
 dontaudit dumpstate update_engine:binder call;
+allow dumpstate proc_net_tcp_udp:file r_file_perms;