ARM: dts: aspeed: Add Portwell Neptune machine

Initial introduction of Portwell Neptune family equipped with Aspeed 2500 BMC SoC. Neptune is a x86 server development kit with a ASPEED ast2500 BMC manufactured by Portwell. Specifically, This adds the neptune platform device tree file including the flash layout used by the neptune machines.

---
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 arch/arm/boot/dts/Makefile                         |   3 +-
 arch/arm/boot/dts/aspeed-bmc-portwell-neptune.dts  | 158 +++++++++++++++++++++
 3 files changed, 161 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/boot/dts/aspeed-bmc-portwell-neptune.dts

index daf465be..ad3406d 100644
@@ -255,6 +255,7 @@ pine64	Pine64
 pixcir  PIXCIR MICROELECTRONICS Co., Ltd
 plathome	Plat'Home Co., Ltd.
 plda	PLDA
+portwell	Portwell Inc.
 poslab	Poslab Technology Co., Ltd.
 powervr	PowerVR (deprecated, use img)
 pulsedlight	PulsedLight, Inc

index 5cfee25..4746060 100644
@@ -1061,7 +1061,8 @@ dtb-$(CONFIG_ARCH_ASPEED) += \
 	aspeed-bmc-opp-romulus.dtb \
 	aspeed-bmc-opp-witherspoon.dtb \
 	aspeed-bmc-opp-zaius.dtb \
-	aspeed-bmc-quanta-q71l.dtb
+	aspeed-bmc-quanta-q71l.dtb \
+	aspeed-bmc-portwell-neptune.dtb
 endif
 
 dtstree		:= $(srctree)/$(src)

2.9.5