GTA04 DT: added labels for LCD and hwmon-battery

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
GTA04b2 DT: added better panel and battery config (not tested)

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
GTA04b3 DT: added better panel and battery config (not tested)

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