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
(cherry picked from commit d22efb80e1bd1aea3710041fd6cd9b0dfd808149)
cm: sepolicy: Add contexts for cm recovery

 * Allow setup of secure adb (setup_adbd)

 * minivold in recovery

Change-Id: Id1243154f4016b59e54890404cadea46a2aad212
(cherry picked from commit 39a4244c7777a08c900743f8ef9a8fcf88fb7843)