package/kvm-unit-tests: fix build on big endian aarch64 targets

When building with BR2_cortex_a76 in big endian mode, the build of
the kvm-unit-tests is currently failing since the "--arch" option
of the configure script is not set right. We also have to look at
BR2_aarch64_be in this case to get this initialized properly.

Fixes: f7228dadd371 ("package/kvm-unit-tests: add more arm support")
Signed-off-by: Thomas Huth <huth@tuxfamily.org>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

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

@@ -10,7 +10,7 @@ KVM_UNIT_TESTS_SITE = https://gitlab.com/kvm-unit-tests/kvm-unit-tests/-/archive
 KVM_UNIT_TESTS_LICENSE = GPL-2.0, LGPL-2.0
 KVM_UNIT_TESTS_LICENSE_FILES = COPYRIGHT
 
-ifeq ($(BR2_aarch64),y)
+ifeq ($(BR2_aarch64)$(BR2_aarch64_be),y)
 KVM_UNIT_TESTS_ARCH = aarch64
 else ifeq ($(BR2_arm),y)
 KVM_UNIT_TESTS_ARCH = arm