tests/lib: Enforce ux_locales-test with CONFIG_VBOOT

The ux_locales-test relies on the ability to determine supported
locales for the platform. However, this information is unavailable
without VBOOT config being enabled. Therefore, enforce this test for
platforms with VBOOT config alone to avoid unnecessary failures.

Change-Id: I2828eb062e2b601e073e7dab9aef7316fc6ba2cd
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79056
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hsuan-ting Chen <roccochen@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/tests/lib/Makefile.inc b/tests/lib/Makefile.inc
index 3b8e93c..0cab1ba 100644
--- a/tests/lib/Makefile.inc
+++ b/tests/lib/Makefile.inc
@@ -250,3 +250,4 @@
 			cbfs_unmap \
 			vb2api_get_locale_id \
 			vboot_get_context
+ux_locales-test-config += CONFIG_VBOOT=1