ARM: dts: aspeed: Adding Inventec Starscream BMC

Initial introduction of Inventec Starscream x86 family
equipped with AST2600 BMC SoC.

Signed-off-by: Chen PJ <Chen.pj@inventec.com>
Link: https://lore.kernel.org/r/20230703060222.24263-2-chen.pj@inventec.com


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