Fix ADN records loading removing EFEXT1 dependency.

Currently if EFEXT1 file is not present on a card a
runtime exception is thrown, and ADN records are not
loaded.

Fix: Allow ADN records loading even if EFEXT1 file is
not present by not throwing runtime exception.
Also in AdnRecordCache, find the free EXT1 record and
pass it to updateEF method, inorder to add the contact
with number greater than 20 in size.

Change-Id: Ibce813f259a1b734c57d15b98d7ac98d7f553bb4
CRs-Fixed: 927889