a8k: Implement platform specific power off
Implements a way to add platform specific power off code to a Marvell Armada 8K platform. Marvell Armada 8K boards can now add a board/system_power.c file that contains a system_power_off() function. This function can now send a command to a power management MCU or other board periferals before shutting the board down. Signed-off-by: Luka Kovacic <firstname.lastname@example.org> Cc: Luka Perkov <email@example.com> Change-Id: Iaba20bc2f603195679c54ad12c0c18962dd8e3db --- I am working on a device that will be ported later, which has a custom power management MCU that handles LEDs, board power and fans and requires this separation.