[mellanox][platform api] fix a missing import time module (#6458)

“time" module was missed to be imported and will cause an error when the branch hit.

Signed-off-by: Kebo Liu <kebol@nvidia.com>

platform/mellanox/mlnx-platform-api/sonic_platform/eeprom.py

@@ -8,6 +8,7 @@
 import os
 import sys
 import re
+import time
 
 if sys.version_info.major == 3:
     from io import StringIO