phy: phy-mtk-tphy: make ref clock optional
If make the ref clock optional, no need refer to fixed-clock when the ref clock is always on or comes from oscillator directly. Signed-off-by: NChunfeng Yun <chunfeng.yun@mediatek.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NRyder Lee <ryder.lee@mediatek.com>
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