selinux: Fix healthd's access to /dev nodes

Our healthd's support for power-on alarms adds some steps that imply
reading files its user doesn't own. Let it.

Change-Id: I3d4735aaab8fbec7acc460f812bc21f1dfa516ab
cm: sepolicy: Add contexts for cm recovery

 * Allow setup of secure adb (setup_adbd)

 * minivold in recovery

Change-Id: Id1243154f4016b59e54890404cadea46a2aad212