udev: add license information

Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/udev/udev.mk

@@ -3,9 +3,12 @@
 # udev
 #
 #############################################################
+
 UDEV_VERSION = 182
 UDEV_SOURCE = udev-$(UDEV_VERSION).tar.bz2
 UDEV_SITE = $(BR2_KERNEL_MIRROR)/linux/utils/kernel/hotplug/
+UDEV_LICENSE = GPLv2+
+UDEV_LICENSE_FILES = COPYING
 UDEV_INSTALL_STAGING = YES
 
 # mq_getattr is in librt