vendor: add policies for netd

Required due to CAF's abc9c0f4fe574ee9847f118e5d2ae8c530bac650 in
system/netd

Fixes showing how many devices are connected to the tethered hotspot

Change-Id: I1d83f7ac0b28efa6973e0baf429de2a398c471e3
Merge remote-tracking branch 'cm/cm-12.0' into cm-12.0