riotboard, syzygy_hub: Disable SPL_FALCON_BOOT_MMCSD

Looking at the git history and values used for the raw kernel/args
location, it's clear these platforms only ever did Falcon Mode via
filesystem images and not raw MMC/SD locations.  Disable
CONFIG_SPL_FALCON_BOOT_MMCSD.

Signed-off-by: Tom Rini <trini@konsulko.com>
2 files changed