New version of kconfig requires trailing slash at the end of KCONFIG_SPLITCONFIG to indicate that it is a directory path. Signed-off-by: Jakub Czapiga <jacz@semihalf.com> Change-Id: I1a11eca21c4aa5a6260006c4ba2cb419eca8a802 Reviewed-on: https://review.coreboot.org/c/coreboot/+/56337 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>