RK3399_ROCKPRO64 has been picked from pine64/rockpro64 but here we deal
with orangepi-rk3399, so let's change the label to RK3399_ORANGEPI.
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>