xen/riscv: introduce empty <asm/string.h>

To include <xen/lib.h> <asm/string.h> is required

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/xen/arch/riscv/include/asm/string.h b/xen/arch/riscv/include/asm/string.h
new file mode 100644 (file)
index 0000000..a26ba8f
--- /dev/null
+++ b/xen/arch/riscv/include/asm/string.h
@@ -0,0 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_RISCV_STRING_H
+#define _ASM_RISCV_STRING_H
+
+#endif /* _ASM_RISCV_STRING_H */