mmc-utils: ffu: Add ffu multi-command set handler

In preparation of sending the fw image in several chunks.
While at it, make use of set_single_cmd() to preapare CMD23 and CMD25.

Signed-off-by: Avri Altman <avri.altman@wdc.com>
Link: https://lore.kernel.org/r/20230625103814.105-5-avri.altman@wdc.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
1 file changed