ARM: dts: aspeed: Add Facebook Fuji (AST2600) BMC

Add initial version of device tree for Facebook Fuji (AST2600) BMC.

Fuji is Facebook's next generation switch platform with an AST2600 BMC
integrated for health monitoring purpose.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20210805222818.8391-7-rentao.bupt@gmail.com


Signed-off-by: Joel Stanley <joel@jms.id.au>