ARM: dts: aspeed: Adding Inventec Transformers BMC

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

Signed-off-by: Tommy Lin <Lin.TommySC@inventec.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/7d7b20575f994a3c9018223a3c5f198d@inventec.com


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