makesd: fix DragonFly SD image

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
scripts: improve ./charger script

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
updated for new gta04a4.dtb

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>