package/qoriq-restool: fix license

In Buildroot, we don't use the official SPDX code GPL-2.0-or-later,
but GPL-2.0+.

Fixes: 2a972212b43100dadbe9c2337264849f3b51552d package/qoriq-restool: new package
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/qoriq-restool/qoriq-restool.mk

@@ -6,7 +6,7 @@
 
 QORIQ_RESTOOL_VERSION = lf-6.12.20-2.0.0-3-gb44748e
 QORIQ_RESTOOL_SITE = $(call github,nxp-qoriq,restool,$(QORIQ_RESTOOL_VERSION))
-QORIQ_RESTOOL_LICENSE = BSD-3-Clause or GPL-2.0-or-later
+QORIQ_RESTOOL_LICENSE = BSD-3-Clause or GPL-2.0+
 QORIQ_RESTOOL_LICENSE_FILES = LICENSE
 
 define QORIQ_RESTOOL_BUILD_CMDS