csv: fix missing import (broken CSV support)

with Change I38f5d36d16b41b5d516a6a3e2ec1d09637883932, new constants
for file identifiers were introduced. When csv file input is used,
then pySim-prog.py uses one of these constans without importing
it from ts_51_011.py

- Add missing import

Change-Id: Ic5b067b16ec204c2ba2264b1ffb48d37be8d5eb3

pySim-prog.py

@@ -40,7 +40,7 @@ except ImportError:
 from pySim.commands import SimCardCommands
 from pySim.cards import _cards_classes
 from pySim.utils import h2b, swap_nibbles, rpad, derive_milenage_opc, calculate_luhn
-
+from pySim.ts_51_011 import EF
 
 def parse_options():