lantiq: ltq-deu: Remove the "DEU test manager"

Remove the "DEU test manager" code which has not been used for more than
two years (as the kernel module is not installed anymore since r38731).
This fixes compilation on kernel 4.3, which removes
aead_request_set_assoc (and newer kernels).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
SVN-Revision: 48308