package/kvm-unit-tests: fix license information

Some files in kvm-unit-tests are licensed under the GPL v2 nowadays:

 https://gitlab.com/kvm-unit-tests/kvm-unit-tests/-/commit/b29b222beb424a00

Signed-off-by: Thomas Huth <huth@tuxfamily.org>
[yann.morin.1998@free.fr: do not replace LGPLGv2, add to the list]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/kvm-unit-tests/kvm-unit-tests.mk

@@ -7,7 +7,7 @@
 KVM_UNIT_TESTS_VERSION = 2022-03-08
 KVM_UNIT_TESTS_SOURCE = kvm-unit-tests-v$(KVM_UNIT_TESTS_VERSION).tar.bz2
 KVM_UNIT_TESTS_SITE = https://gitlab.com/kvm-unit-tests/kvm-unit-tests/-/archive/v$(KVM_UNIT_TESTS_VERSION)
-KVM_UNIT_TESTS_LICENSE = LGPL-2.0
+KVM_UNIT_TESTS_LICENSE = GPL-2.0, LGPL-2.0
 KVM_UNIT_TESTS_LICENSE_FILES = COPYRIGHT
 
 ifeq ($(BR2_aarch64),y)