package/imx-mkimage: fix license file

COPYING file is now at the top level, see:
https://source.codeaurora.org/external/imx/imx-mkimage/commit/?id=4a7e6873dc9de70f61dcbdb9c15a945a2e31d272

Fixes:
 - http://autobuild.buildroot.org/results/03cffcf6959d5a6efa05b6e3c71d95d096cc942a

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/imx-mkimage/imx-mkimage.hash

@@ -1,3 +1,3 @@
 # Locally calculated
 sha256 d5d7afca6abef4fc6653a2f8b99545d62921a5ab8c44ff3481120232e2162dde  imx-mkimage-rel_imx_4.14.78_1.0.0_ga.tar.gz
-sha256 231f7edcc7352d7734a96eef0b8030f77982678c516876fcb81e25b32d68564c  iMX8dv/COPYING
+sha256 231f7edcc7352d7734a96eef0b8030f77982678c516876fcb81e25b32d68564c  COPYING

package/imx-mkimage/imx-mkimage.mk

@@ -8,7 +8,7 @@ IMX_MKIMAGE_VERSION = rel_imx_4.14.78_1.0.0_ga
 IMX_MKIMAGE_SITE = https://source.codeaurora.org/external/imx/imx-mkimage
 IMX_MKIMAGE_SITE_METHOD = git
 IMX_MKIMAGE_LICENSE = GPL-2.0+
-IMX_MKIMAGE_LICENSE_FILES = iMX8dv/COPYING
+IMX_MKIMAGE_LICENSE_FILES = COPYING
 HOST_IMX_MKIMAGE_DEPENDENCIES = host-zlib
 
 ifeq ($(BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX8M),y)