reform-flash-uboot: add MMCDEV var for A311D
This MR fixes error the error /usr/sbin/reform-flash-uboot: 94: MMCDEV: parameter not set
when running sudo reform-flash-uboot sd
on the A311D by defining the variable MMCDEV
. Otherwise, the safety check intended to prohibit EMMC flashing on A311D fails.
With MMCDEV
set, the script runs through and flashes the SD card.