ARM: dts: aspeed: Add Mihawk BMC platform

The Mihawk BMC is an ASPEED ast2500 based BMC that is part of an
OpenPower Power9 server.
Signed-off-by: Ben Pai <Ben_Pai@wistron.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/Makefile

@@ -1282,6 +1282,7 @@ dtb-$(CONFIG_ARCH_ASPEED) += \
 	aspeed-bmc-lenovo-hr855xg2.dtb \
 	aspeed-bmc-microsoft-olympus.dtb \
 	aspeed-bmc-opp-lanyang.dtb \
+	aspeed-bmc-opp-mihawk.dtb \
 	aspeed-bmc-opp-palmetto.dtb \
 	aspeed-bmc-opp-romulus.dtb \
 	aspeed-bmc-opp-swift.dtb \