SELinux: su: Remove extra quote in a comment

* Fixes
  vendor/cm/sepolicy/su.te:46:WARNING 'unrecognized character' at token '''

Change-Id: I3957ba7ac05062766cbf6c8f3c3975f20c95532e
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