sunxi-tools: fix license file

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/sunxi-tools/sunxi-tools.mk

@@ -7,7 +7,7 @@
 SUNXI_TOOLS_VERSION = v1.4.1
 SUNXI_TOOLS_SITE = $(call github,linux-sunxi,sunxi-tools,$(SUNXI_TOOLS_VERSION))
 SUNXI_TOOLS_LICENSE = GPLv2+
-SUNXI_TOOLS_LICENSE_FILES = COPYING
+SUNXI_TOOLS_LICENSE_FILES = LICENSE.md
 HOST_SUNXI_TOOLS_DEPENDENCIES = host-libusb host-pkgconf
 FEX2BIN = $(HOST_DIR)/usr/bin/fex2bin