clk: fixed_rate: add dummy enable() function

This is used to avoid clk_enable() return -ENOSYS.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ryder Lee <ryder.lee@mediatek.com>
1 file changed