ARM: dts: at91: sama5d4: Add new MA5D4EVK manufacturer compat

The board is now manufactured by Aries Embedded GmbH, update compat string.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>