use HARDWARE.reboot() when unkillable process doesnt stop

selfdrive/manager.py

@@ -371,11 +371,8 @@ def kill_managed_process(name):
         join_process(running[name], 15)
         if running[name].exitcode is None:
           cloudlog.critical("unkillable process %s failed to die!" % name)
-          # TODO: Use method from HARDWARE
-          if ANDROID:
-            cloudlog.critical("FORCE REBOOTING PHONE!")
-            os.system("date >> /sdcard/unkillable_reboot")
-            os.system("reboot")
+          os.system("date >> /sdcard/unkillable_reboot")
+          HARDWARE.reboot()
           raise RuntimeError
       else:
         cloudlog.info("killing %s with SIGKILL" % name)