riscv: spacemit: bananapi_f3: initial support added

Add basic support for SpacemiT's Banana Pi F3 board.
Update the k1.dtsi align with mainline.
Note that the device tree files follow the mainline Linux source[1].

Links: https://patches.linaro.org/project/linux-serial/patch/20240730-k1-01-basic-dt-v5-8-98263aae83be@gentoo.org/ [1]

Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
Signed-off-by: Huan Zhou <pericycle.cc@gmail.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Reviewed-by: Yixun Lan <dlan@gentoo.org>
Tested-by: Marcel Ziswiler <marcel@ziswiler.com>
diff --git a/arch/riscv/dts/k1-bananapi-f3.dts b/arch/riscv/dts/k1-bananapi-f3.dts
new file mode 100644
index 0000000..d2486f7
--- /dev/null
+++ b/arch/riscv/dts/k1-bananapi-f3.dts
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright (C) 2024 Yangyu Chen <cyy@cyyself.name>
+ */
+
+#include "k1.dtsi"
+#include "binman.dtsi"
+
+/ {
+	model = "Banana Pi BPI-F3";
+	compatible = "bananapi,bpi-f3", "spacemit,k1";
+
+	chosen {
+		stdout-path = "serial0";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x00000000 0x00000000 0x00000000 0x80000000>;
+	};
+};
+
+&uart0 {
+	status = "okay";
+};