If coreboot serial output is not enabled, it is pointless to enable
iPXE serial console as there's nowhere for the outout to go.
Change-Id: I91e76f255a674f8bfb849310f791b57a8cbcfd09
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90061
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Walter Sonius <walterav1984@gmail.com>
Reviewed-by: Filip Lewiński <filip.lewinski@3mdeb.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
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