ethtool: bump to version 4.15

Add the LICENSE file to license files.

Cc: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/ethtool/ethtool.hash

@@ -1,4 +1,5 @@
 # From https://www.kernel.org/pub/software/network/ethtool/sha256sums.asc
-sha256	b7c1a380007d30eaf261a63b3cfc000f9d93f9eb7626dcd48b5d2a733af99cba	ethtool-4.13.tar.xz
+sha256	71f7fd32483ffdc7c6c4d882e230714eb101df0a46cbe396dbeb8ac78f1ef91a	ethtool-4.15.tar.xz
 # Locally calculated
 sha256	8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643	COPYING
+sha256	5d632934396f90c82dfebe3c9512648bbb6333b406113d0cd331b0e0aa2d34a1	LICENSE

package/ethtool/ethtool.mk

@@ -4,11 +4,11 @@
 #
 ################################################################################
 
-ETHTOOL_VERSION = 4.13
+ETHTOOL_VERSION = 4.15
 ETHTOOL_SOURCE = ethtool-$(ETHTOOL_VERSION).tar.xz
 ETHTOOL_SITE = $(BR2_KERNEL_MIRROR)/software/network/ethtool
 ETHTOOL_LICENSE = GPL-2.0
-ETHTOOL_LICENSE_FILES = COPYING
+ETHTOOL_LICENSE_FILES = LICENSE COPYING
 ETHTOOL_CONF_OPTS = \
 	$(if $(BR2_PACKAGE_ETHTOOL_PRETTY_PRINT),--enable-pretty-dump,--disable-pretty-dump)