libsocketcan: add LICENSE file
libsocketcan: add LICENSE file

Took LGPL v2.1+ from the FSF website which is stated in libsocketcan.c.

Signed-off-by: Wolfram Sang <3883f8aab0424a154a3bcb43ff874b819786efbe@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <4a0ea1158d3cc63151119c05b1bff00c0bdbf421@pengutronix.de>

lalten/libsocketcan,lalten/libsocketcan,lalten/libsocketcan