healthd : allow healthd to read RTC/alarm devices

* Charger mode support for off mode alarms require healthd to read
  RTC/alarm devices.

REF: CYNGNOS-2073
Change-Id: I5c66699998d17def63a2e1f8981f088448cc8aa6
diff --git a/common/healthd.te b/common/healthd.te
index 3f7f25b..3212afa 100644
--- a/common/healthd.te
+++ b/common/healthd.te
@@ -1,3 +1,5 @@
 r_dir_file(healthd, sysfs_battery_supply)
 r_dir_file(healthd, sysfs_usb_supply)
 r_dir_file(healthd, sysfs_thermal);
+allow healthd alarm_device:chr_file rw_file_perms;
+allow healthd rtc_device:chr_file r_file_perms;