The dt option `speed_shift_enable` is obsolete now. Drop it.
Change-Id: I5ac3b8efe37aedd442962234478fcdce675bf105
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46462
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>