platform/x86/amd/pmc: Use managed APIs for mutex

Adopt managed devm_* APIs for handling mutex creation and deletion,
facilitating automatic resource cleanup.

Co-developed-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20250305142615.410178-4-Shyam-sundar.S-k@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: Shyam Sundar S K

drivers/platform/x86/amd/pmc/pmc.c

@@ -783,7 +783,9 @@ static int amd_pmc_probe(struct platform_device *pdev)
 		goto err_pci_dev_put;
 	}
 
-	mutex_init(&dev->lock);
+	err = devm_mutex_init(dev->dev, &dev->lock);
+	if (err)
+		return err;
 
 	/* Get num of IP blocks within the SoC */
 	amd_pmc_get_ip_info(dev);
@@ -822,7 +824,6 @@ static void amd_pmc_remove(struct platform_device *pdev)
 	pci_dev_put(dev->rdev);
 	if (IS_ENABLED(CONFIG_AMD_MP2_STB))
 		amd_mp2_stb_deinit(dev);
-	mutex_destroy(&dev->lock);
 }
 
 static const struct acpi_device_id amd_pmc_acpi_ids[] = {