soc: Add support for the WCH CH32V303

Adds support for building an image for the ch32v303.

Signed-off-by: Miguel Gazquez <miguel.gazquez@bootlin.com>

soc/wch/ch32v/qingke_v4f/vector.S

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2024 Michael Hope
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/toolchain.h>
+
+#ifndef CONFIG_VECTOR_TABLE_SIZE
+#error "VECTOR_TABLE_SIZE must be defined"
+#endif
+
+/* Exports */
+GTEXT(__start)
+
+/* Imports */
+GTEXT(__initialize)
+
+SECTION_FUNC(vectors, ivt)
+	.option norvc
+	/* Jump to 0x08000008, into the main flash zone where j __start is */
+	lui	x5, 0x8000
+	jr	0x8(x5)
+	j       __start
+	.rept   CONFIG_VECTOR_TABLE_SIZE
+	.word	_isr_wrapper
+	.endr
+
+SECTION_FUNC(vectors, __start)
+	li 	a0, 0xf
+	csrw	mtvec, a0
+	j	__initialize