This is the third step to make MT2701 HDMI stable.
We should not change the rate of parent for hdmi phy when
doing round_rate for this clock. The parent clock of hdmi
phy must be the same as it. We change it when doing set_rate
only.
Signed-off-by: NWangyan Wang <wangyan.wang@mediatek.com>
Signed-off-by: NCK Hu <ck.hu@mediatek.com>