configs: imx6dl-mamoj: Add DFU support

Add DFU support for BTicino Mamoj board and update
the same steps in README.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Simone CIANNI <simone.cianni@bticino.it>
Signed-off-by: Raffaele RECALCATI <raffaele.recalcati@bticino.it>
3 files changed