ARM: dts: mstar: Add board for 100ask DongShanPiOne

The DongShanPiOne is little SigmaStar SSD202D based module
from 100ask.

Add an initial dts for this board.

Link: http://linux-chenxing.org/infinity2/dongshanpione/
Signed-off-by: Daniel Palmer <[e-mail]>

arch/arm/boot/dts/Makefile

···
 dtb-$(CONFIG_ARCH_MILBEAUT) += milbeaut-m10v-evb.dtb
 dtb-$(CONFIG_ARCH_MSTARV7) += \
 	mstar-infinity-msc313-breadbee_crust.dtb \
+	mstar-infinity2m-ssd202d-100ask-dongshanpione.dtb \
 	mstar-infinity2m-ssd202d-miyoo-mini.dtb \
 	mstar-infinity2m-ssd202d-wirelesstag-ido-sbc2d06-v1b-22w.dtb \
 	mstar-infinity2m-ssd202d-ssd201htv2.dtb \

arch/arm/boot/dts/mstar-infinity2m-ssd202d-100ask-dongshanpione.dts

···
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2021 thingy.jp.
+ * Author: Daniel Palmer <[e-mail]>
+ */
+
+/dts-v1/;
+#include "mstar-infinity2m-ssd202d.dtsi"
+
+/ {
+	model = "DongShanPi One";
+	compatible = "100ask,dongshanpione", "mstar,infinity2m";
+
+	aliases {
+		serial0 = &pm_uart;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&pm_uart {
+	status = "okay";
+};