edac: phytium_edac: Convert to platform remove callback returning void

0edb555: platform: Make platform_driver::remove() return void
cause build error, so convert .remove from int to void

Log:
drivers/edac/phytium_edac.c:470:19: error: initialization of ‘void (*)(struct platform_device *)’ from incompatible pointer type ‘int (*)(struct platform_device *)’ [-Werror=incompatible-pointer-types]
  470 |         .remove = phytium_edac_remove,
      |                   ^~~~~~~~~~~~~~~~~~~
drivers/edac/phytium_edac.c:470:19: note: (near initialization for ‘phytium_edac_driver.<anonymous>.remove’)

drivers/edac/phytium_edac.c

@@ -450,13 +450,11 @@ static int phytium_edac_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int phytium_edac_remove(struct platform_device *pdev)
+static void phytium_edac_remove(struct platform_device *pdev)
 {
 	struct phytium_edac *edac = dev_get_drvdata(&pdev->dev);
 
 	phytium_edac_device_remove(edac);
-
-	return 0;
 }
 
 static const struct of_device_id phytium_edac_of_match[] = {