meson: Add missing config option for J-Link SPI

Signed-off-by: Marc Schink <dev@zapb.de>
Change-Id: I476c649f9db7342688560aac9ee5df056517a028
Reviewed-on: https://review.coreboot.org/c/flashrom/+/48478
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
2 files changed