CXX: Make spi_flash related part works

components/spi_flash/sim/stubs/bsd/include/bsd_strings.h

@@ -0,0 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+size_t strlcpy(char *dst, const char *src, size_t dsize);