spi: atmel-quadspi.c: Fix the buswidth adjustment between spi-mem and controller

Use the spi_mem_default_supports_op() core helper in order to take into
account the buswidth specified by the user in device tree.

Cc: <stable@vger.kernel.org>
Fixes: 0e6aae0 ("spi: Add QuadSPI driver for Atmel SAMA5D2")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>

Author: ambarus

drivers/spi/atmel-quadspi.c

@@ -455,6 +455,9 @@ static bool atmel_qspi_supports_op(struct spi_mem *mem,
 {
 	struct atmel_qspi *aq = spi_controller_get_devdata(mem->spi->master);
 
+	if (!spi_mem_default_supports_op(mem, op))
+		return false;
+
 	if (aq->caps->octal) {
 		if (atmel_qspi_sama7g5_find_mode(op) < 0)
 			return false;