phy: fsl-imx8mq-usb: fix tuning parameter name

According to fsl,imx8mq-usb-phy.yaml, this tuning parameter should be
fsl,phy-pcs-tx-deemph-3p5db-attenuation-db.

Fixes: 63c85ad0 ("phy: fsl-imx8mp-usb: add support for phy tuning")
Cc: stable@vger.kernel.org
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20240801124642.1152838-1-xu.yang_2@nxp.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/freescale/phy-fsl-imx8mq-usb.c

@@ -176,7 +176,7 @@ static void imx8m_get_phy_tuning_data(struct imx8mq_usb_phy *imx_phy)
 		imx_phy->comp_dis_tune =
 			phy_comp_dis_tune_from_property(imx_phy->comp_dis_tune);
 
-	if (device_property_read_u32(dev, "fsl,pcs-tx-deemph-3p5db-attenuation-db",
+	if (device_property_read_u32(dev, "fsl,phy-pcs-tx-deemph-3p5db-attenuation-db",
 				     &imx_phy->pcs_tx_deemph_3p5db))
 		imx_phy->pcs_tx_deemph_3p5db = PHY_TUNE_DEFAULT;
 	else