add -F options to compare to file crc
it's usefull to compare what you flash in a partition
it's selectable by CONFIG_CMD_CRC_CMP
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>