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                         |   1 +
 arch/arm/boot/dts/aspeed-bmc-portwell-neptune.dts  | 163 +++++++++++++++++++++
 3 files changed, 165 insertions(+)
 create mode 100644 arch/arm/boot/dts/aspeed-bmc-portwell-neptune.dts

index 84601d8..9dbbe7d 100644
@@ -228,6 +228,7 @@ pine64	Pine64
 pixcir  PIXCIR MICROELECTRONICS Co., Ltd
 plathome	Plat'Home Co., Ltd.
 plda	PLDA
+portwell	Portwell Inc.
 powervr	PowerVR (deprecated, use img)
 pulsedlight	PulsedLight, Inc
 qca	Qualcomm Atheros, Inc.

index 7c54fc8..044b960 100644
@@ -993,6 +993,7 @@ dtb-$(CONFIG_ARCH_ASPEED) += aspeed-bmc-opp-palmetto.dtb \
 	aspeed-bmc-mellanox-msn.dtb \
 	aspeed-bmc-quanta-q71l.dtb \
 	aspeed-bmc-intel-s2600wf.dtb \
+	aspeed-bmc-portwell-neptune.dtb \
 	aspeed-ast2500-evb.dtb
 endif
 

2.9.5