socketcand: add license information

[Peter: use socketcand.c as license file]
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/socketcand/socketcand.mk

@@ -7,6 +7,8 @@
 SOCKETCAND_VERSION = 274e4e44107f6138a29bbc4e20f9fbd2a7d4dab1
 SOCKETCAND_SITE = $(call github,dschanoeh,socketcand,$(SOCKETCAND_VERSION))
 SOCKETCAND_AUTORECONF = YES
+SOCKETCAND_LICENSE = BSD-3c or GPLv2
+SOCKETCAND_LICENSE_FILES = socketcand.c
 
 ifeq ($(BR2_PACKAGE_LIBCONFIG),y)
 SOCKETCAND_DEPENDENCIES = libconfig