arm: add initial support for the Phytium Pomelo Board

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

Signed-off-by: weichangzheng <nicholas_zheng@outlook.com>
diff --git a/board/phytium/pomelo/Kconfig b/board/phytium/pomelo/Kconfig
new file mode 100644
index 0000000..281aa8f
--- /dev/null
+++ b/board/phytium/pomelo/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_POMELO
+
+config SYS_BOARD
+	default "pomelo"
+
+config SYS_VENDOR
+	default "phytium"
+
+config SYS_CONFIG_NAME
+	default "pomelo"
+
+endif