Correction of flash SD-CARD recipe

Created by: eyssartk

• We observed errors when the SDCARD was previously formated in MBR. The -g flag is converting the partition table to GPT.

• Also, error happens whith internal SDCARD reader. Those type of device enumerates the partitions differently :

/dev/mmcblk1
/dev/mmcblk1p1
/dev/mmcblk1p2

lsblk call correct this error.