phy: freescale: Initialize priv->lock

Initialize priv->lock to fix the following warning.

WARNING: CPU: 0 PID: 12 at kernel/locking/mutex.c:577 __mutex_lock+0x70c/0x8b8
 Modules linked in:
 Hardware name: Freescale i.MX8QM MEK (DT)
 Call trace:
  __mutex_lock+0x70c/0x8b8 (P)
  mutex_lock_nested+0x24/0x30
  imx_hsio_power_on+0x4c/0x764
  phy_power_on+0x7c/0x12c
  imx_pcie_host_init+0x1d0/0x4d4
  dw_pcie_host_init+0x188/0x4b0
  imx_pcie_probe+0x324/0x6f4
  platform_probe+0x5c/0x98
  really_probe+0xbc/0x29c
  __driver_probe_device+0x78/0x12c
  driver_probe_device+0xd8/0x160
  __device_attach_driver+0xb8/0x138
  bus_for_each_drv+0x84/0xe4
  __device_attach_async_helper+0xb8/0xdc
  async_run_entry_fn+0x34/0xe0
  process_one_work+0x220/0x694
  worker_thread+0x1c0/0x36c
  kthread+0x14c/0x224

Fixes: 82c56b6 ("phy: freescale: imx8qm-hsio: Add i.MX8QM HSIO PHY driver support")
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20250925013806.569658-1-xiaolei.wang@windriver.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: xiaoleiwang123456

drivers/phy/freescale/phy-fsl-imx8qm-hsio.c

@@ -533,7 +533,7 @@ static struct phy *imx_hsio_xlate(struct device *dev,
 
 static int imx_hsio_probe(struct platform_device *pdev)
 {
-	int i;
+	int i, ret;
 	void __iomem *off;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
@@ -545,6 +545,9 @@ static int imx_hsio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	priv->dev = &pdev->dev;
 	priv->drvdata = of_device_get_match_data(dev);
+	ret = devm_mutex_init(dev, &priv->lock);
+	if (ret)
+		return ret;
 
 	/* Get HSIO configuration mode */
 	if (of_property_read_string(np, "fsl,hsio-cfg", &priv->hsio_cfg))