python-serial: fix legal info

python-serial is provided under BSD-3-Clause license.

Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python-serial/python-serial.mk

@@ -7,7 +7,7 @@
 PYTHON_SERIAL_VERSION = 3.1
 PYTHON_SERIAL_SOURCE = pyserial-$(PYTHON_SERIAL_VERSION).tar.gz
 PYTHON_SERIAL_SITE = https://pypi.python.org/packages/ce/9c/694ce79a9d4a164e109aeba1a40fba23336f3b7554978553e22a5d41d54d
-PYTHON_SERIAL_LICENSE = Python Software Foundation License
+PYTHON_SERIAL_LICENSE = BSD-3-Clause
 PYTHON_SERIAL_LICENSE_FILES = LICENSE.txt
 PYTHON_SERIAL_SETUP_TYPE = setuptools