mtd: nand: Fix typo in MXC Kconfig symbol description

Trivial typo fix.

Signed-off-by: Haolin Li <li.haolin@qq.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 790ee34..d4da639 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -369,7 +369,7 @@
 	imply CMD_NAND
 	help
 	  This enables the NAND driver for the NAND flash controller on the
-	  i.MX27 / i.MX31 / i.MX5 rocessors.
+	  i.MX27 / i.MX31 / i.MX5 processors.
 
 config NAND_MXS
 	bool "MXS NAND support"