Revert "drm/imx: imx-ldb: disable LDB on driver bind"

This reverts commit a43eac2d.
This patch break the i.MX8, revert it firstly.

drivers/gpu/drm/imx/imx-ldb.c

@@ -612,9 +612,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 		return PTR_ERR(imx_ldb->regmap);
 	}
 
-	/* disable LDB by resetting the control register to POR default */
-	regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0);
-
 	imx_ldb->dev = dev;
 
 	if (of_id)