Add support for the iEi Puzzle-M801 board that is based on
the Marvell Armada 88F8040 SoC.

It supports 1 x 288-pin DIMM, DDR4 2400MHz up to 16 GB (ECC).

The iEi Puzzle-M801 board is using a custom MCU to handle board
power management. The MCU is managing the boards power LEDs, fans
and some other periferals. It's using UART for communication.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Change-Id: I0826ef8bf651b69aad5803184f20930ac7212ef8