sandbox: Implement fuzzing engine driver

Add a fuzzing engine driver for the sandbox to take inputs from
libfuzzer and expose them to the fuzz tests.

Signed-off-by: Andrew Scull <ascull@google.com>

drivers/fuzz/sandbox_fuzzing_engine.c

@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2022 Google, Inc.
+ * Written by Andrew Scull <ascull@google.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fuzzing_engine.h>
+#include <asm/fuzzing_engine.h>
+
+static int get_input(struct udevice *dev,
+		     const uint8_t **data,
+		     size_t *size)
+{
+	return sandbox_fuzzing_engine_get_input(data, size);
+}
+
+static const struct dm_fuzzing_engine_ops sandbox_fuzzing_engine_ops = {
+	.get_input = get_input,
+};
+
+static const struct udevice_id sandbox_fuzzing_engine_match[] = {
+	{
+		.compatible = "sandbox,fuzzing-engine",
+	},
+	{},
+};
+
+U_BOOT_DRIVER(sandbox_fuzzing_engine) = {
+	.name = "sandbox-fuzzing-engine",
+	.id = UCLASS_FUZZING_ENGINE,
+	.of_match = sandbox_fuzzing_engine_match,
+	.ops = &sandbox_fuzzing_engine_ops,
+};