m28evk: Fix comment about the number of RAM banks

m28evk has one bank of RAM.

Fix the comment.

Cc: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marek.vasut@gmail.com>

include/configs/m28evk.h

@@ -80,7 +80,7 @@
 /*
  * Memory configurations
  */
-#define	CONFIG_NR_DRAM_BANKS		1		/* 2 banks of DRAM */
+#define	CONFIG_NR_DRAM_BANKS		1		/* 1 bank of DRAM */
 #define	PHYS_SDRAM_1			0x40000000	/* Base address */
 #define	PHYS_SDRAM_1_SIZE		0x40000000	/* Max 1 GB RAM */
 #define	CONFIG_STACKSIZE		0x00010000	/* 128 KB stack */