phy: qcom-qmp-combo: drop unused DP PHY mode op

The set-mode operation is currently only used by the USB part of the
PHY so drop the corresponding callback from the DP PHY ops.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20221114110621.4639-6-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/qualcomm/phy-qcom-qmp-combo.c

@@ -2132,7 +2132,6 @@ static const struct phy_ops qmp_combo_dp_phy_ops = {
 	.calibrate	= qcom_qmp_dp_phy_calibrate,
 	.power_off	= qmp_combo_power_off,
 	.exit		= qmp_combo_exit,
-	.set_mode	= qmp_combo_set_mode,
 	.owner		= THIS_MODULE,
 };