Revert "python-pyasn: fix legal info"

This reverts commit aca82a056b04f1bc1d2578e414d8a8d1eaf66207, which is
needed to revert commit 98c9b1bec6fd511889f38c72bc4aa5aba89e264d,
which itself causes build failures.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python-pyasn/python-pyasn.mk

@@ -7,8 +7,8 @@
 PYTHON_PYASN_VERSION = 1.6.0b1
 PYTHON_PYASN_SOURCE = pyasn-$(PYTHON_PYASN_VERSION).tar.gz
 PYTHON_PYASN_SITE = https://pypi.python.org/packages/31/da/c8338545be0ee7a727c977113e75888e4f1f2b2e10f9284fdfa31dab29bc
-PYTHON_PYASN_LICENSE = MIT, BSD-4c (radix tree)
-PYTHON_PYASN_LICENSE_FILES = LICENSE
+PYTHON_PYASN_LICENSE = BSD-2c
+PYTHON_PYASN_LICENSE_FILES = LICENSE.txt
 PYTHON_PYASN_SETUP_TYPE = distutils
 
 $(eval $(python-package))