dfu: mmc: use the default MMC device if entity specifies it as -1

Use the default MMC device set in the command line if entity specifies it
as -1. This allows to use the same dfu_alt_info string for different MMC
devices (like embedded eMMC and external SD card if data layout is the
same on both devices).

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
1 file changed