Sync the Armada-38x device tree files with Linux 4.20-rc5. The changes
not taken are new compatible strings for the uart and nand flash
controller. The nand binding is best updated if/when the mtd/nand
infrastructure is updated.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>