configs: remove CONFIG_SYS_DSPI_XX references

configs: remove CONFIG_SYS_DSPI_XX references

This patch removes CONFIG_SYS_DSPI_XX options from
include/configs "m68k" .h board files, since CTAR
registers are now set with default values in the cf_spi
driver initialization, and configurable by devicetree.

Note, these options cannot be totally removed from the
whitelist, since still used from boards using fsl_dspi.c
(mostly arm-based boards).

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Angelo Dureghello <angelo@sysam.it>