Add a basic RAM disk overlay for libraries that expect at least one disk driver to be enabled. Signed-off-by: Jordan Yates <jordan@embeint.com>
Add a test validating that Zephyr can compile with the 3 underlying filesystems enabled with only `CONFIG_FILE_SYSTEM_LIB_LINK` enabled. Signed-off-by: Jordan Yates <jordan@embeint.com>