SELinux: su: Remove extra quote in a comment

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

Change-Id: I3957ba7ac05062766cbf6c8f3c3975f20c95532e
(cherry picked from commit 9e0dba30b7349a72e190a1ff3df961f65cf4dac6)

Conflicts:
	sepolicy/su.te
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
(cherry picked from commit e815923b0d31cab8b16dd75f270da077f2efa678)