Add a check to be sure that at least one SPD file will be added and fail
the build when the resulting spd.bin would be empty.
Change-Id: Ic6db1dbe5fed5f242e408bcad4f36dda1b1fa1b4
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45131
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>