mtd: spi-nor: Remove recently added write_disable() call

Remove undocumented write_disable() call. This was added in commit
5d40b3d384 ("mtd: spi-nor: Add parallel and stacked memories support")
without any explanation in the commit message. Remove it.

Fixes: 5d40b3d384 ("mtd: spi-nor: Add parallel and stacked memories support")
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

drivers/mtd/spi/spi-nor-core.c

@@ -2073,10 +2073,6 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
 		if (ret)
 			goto write_err;
 
-		ret = write_disable(nor);
-		if (ret)
-			goto write_err;
-
 		*retlen += written;
 		i += written;
 	}
@@ -2117,10 +2113,6 @@ static int macronix_quad_enable(struct spi_nor *nor)
 	if (ret)
 		return ret;
 
-	ret = write_disable(nor);
-	if (ret)
-		return ret;
-
 	ret = read_sr(nor);
 	if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) {
 		dev_err(nor->dev, "Macronix Quad bit not set\n");
@@ -2182,7 +2174,7 @@ static int spansion_quad_enable_volatile(struct spi_nor *nor, u32 addr_base,
 		return -EINVAL;
 	}
 
-	return write_disable(nor);
+	return 0;
 }
 #endif