replace NO_PERMISSIONS with PERMISSION_NONE

As part of the effort to simplify the design of permission control
between system server and netd, remove the NO_PERMISSIONS constant used
by trafficController and share the constant PERMISSION_NONE with
networkController instead.

Bug: 128944261
Test: netd_integration_test netd_unit_test
Change-Id: If3eb19adc15b6c23c95fc4b9bc699fd1a515e0ac