boards:csk6011a_nano: Add lack flash partition.
* With this change, We don't need to add any overlay then csk6011a_nano can support flash_map testcase. Signed-off-by: 徐宪辉 <xhxu@listenai.com>
* With this change, We don't need to add any overlay then csk6011a_nano can support flash_map testcase. Signed-off-by: 徐宪辉 <xhxu@listenai.com>