md: dm-req-crypt: Change HW FDE to use AES 128

Change encryption algorithm for HW FDE to use AES 128

Change-Id: I3294a42e58c260738c1e77bd9406c1877e19ba28
Acked-by: Baranidharan Muthukumaran <bmuthuku@qti.qualcomm.com>
Signed-off-by: Dinesh K Garg <dineshg@codeaurora.org>