mtd: spi-nor: atmel-quaspi: Typo fix

Just minor typo fix. Fixed in preparation of new driver.

Signed-off: Piotr Bugalski <bugalski.piotr@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/mtd/spi-nor/atmel-quadspi.c

@@ -67,7 +67,7 @@
 #define QSPI_CR_LASTXFER                BIT(24)
 
 /* Bitfields in QSPI_MR (Mode Register) */
-#define QSPI_MR_SSM                     BIT(0)
+#define QSPI_MR_SMM                     BIT(0)
 #define QSPI_MR_LLB                     BIT(1)
 #define QSPI_MR_WDRBT                   BIT(2)
 #define QSPI_MR_SMRM                    BIT(3)
@@ -563,7 +563,7 @@ static int atmel_qspi_init(struct atmel_qspi *aq)
 	qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST);
 
 	/* Set the QSPI controller in Serial Memory Mode */
-	mr = QSPI_MR_NBBITS(8) | QSPI_MR_SSM;
+	mr = QSPI_MR_NBBITS(8) | QSPI_MR_SMM;
 	qspi_writel(aq, QSPI_MR, mr);
 
 	src_rate = clk_get_rate(aq->clk);