Fix pylint warning in python file

Changes:
    - W0611: Unused BuiltIn imported from
      robot.libraries.BuiltIn

Tested:
    - python3 -m pylint lib/tftp_update_utils.py

Change-Id: Ibc74da94d19593e9ede0eee4cf59a92d7454ac11
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/tftp_update_utils.py b/lib/tftp_update_utils.py
index 8e389f8..ca406c9 100644
--- a/lib/tftp_update_utils.py
+++ b/lib/tftp_update_utils.py
@@ -4,9 +4,8 @@
 This module contains functions for tftp update.
 """
 
-import gen_print as gp
+import gen_print as gp  # NOQA
 import state as st
-from robot.libraries.BuiltIn import BuiltIn
 
 
 def get_pre_reboot_state():