dt-bindings: marvell: armada-7k-8k: Add missing 7040 and 8040 board compatibles

dt-bindings: marvell: armada-7k-8k: Add missing 7040 and 8040 board compatibles

There's a number of board compatibles already in use, but not
documented. Add them to the schema. These are added to the existing
entries which are missing any board specific compatible. Entries with
only SoC compatibles should not have been allowed in the first place.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>