ARM: dts: aspeed: Adding Lenovo Hr630 BMC

Initial introduction of Lenovo Hr630 family equipped with
Aspeed 2500 BMC SoC. Hr630 is a x86 server development kit
with a ASPEED ast2500 BMC manufactured by Lenovo.

Signed-off-by: Andrew Peng <pengms1@lenovo.com>
Signed-off-by: Yonghui Liu <liuyh21@lenovo.com>
Signed-off-by: Lisa Liu <liuyj19@lenovo.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Patrick Venture <venture@google.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>