arm: add initial support for the Phytium Durian Board

This adds platform code and the device tree for the Phytium Durian Board.
The initial support comprises the UART and the PCIE.

Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Kever Yang <kever.yang@rock-chips.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>

Signed-off-by: Steven Hao <liuhao@phytium.com.cn>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 251d32c..89ab800 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -834,6 +834,8 @@
 dtb-$(CONFIG_TARGET_VEXPRESS_CA9X4) += vexpress-v2p-ca9.dtb
 dtb-$(CONFIG_TARGET_VEXPRESS_CA15_TC2) += vexpress-v2p-ca15_a7.dtb
 
+dtb-$(CONFIG_TARGET_DURIAN) += phytium-durian.dtb
+
 targets += $(dtb-y)
 
 # Add any required device tree compiler flags here