arm64: dts: armada-3720-espressobin: use Linux model/compatible strings

Fix the actual board vendor and ease synching dts files from Linux.

Signed-off-by: Andre Heider <a.heider@gmail.com>
Reviewed-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>