ARM: dts: aspeed: Add IBM Bonnell system BMC devicetree

Add a devicetree for the new Bonnell system.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Jim Wright <wrightj@linux.ibm.com>
Link: https://lore.kernel.org/r/20220818202422.741275-1-eajames@linux.ibm.com


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