healthd: normal and charger mode startup

Command line flag -n tells healthd not to use (or wait for) servicemanager
in charger mode.

Change-Id: I255f9597dff6fc904f5ed20fd02f52c0531d14f8

rootdir/init.rc

@@ -402,6 +402,16 @@ service ueventd /sbin/ueventd
     critical
     seclabel u:r:ueventd:s0
 
+service healthd /sbin/healthd
+    class core
+    critical
+    seclabel u:r:healthd:s0
+
+service healthd-charger /sbin/healthd -n
+    class charger
+    critical
+    seclabel u:r:healthd:s0
+
 on property:selinux.reload_policy=1
     restart ueventd
     restart installd
@@ -432,6 +442,7 @@ service servicemanager /system/bin/servicemanager
     user system
     group system
     critical
+    onrestart restart healthd
     onrestart restart zygote
     onrestart restart media
     onrestart restart surfaceflinger