nand_spl: nand_boot.c: Remove last CONFIG_SYS_NAND_READ_DELAY occurance

Remove the last CONFIG_SYS_NAND_READ_DELAY occurance from nand_boot.c.
I missed this one in patch a9c847cb [nand_spl: nand_boot.c: Remove
CONFIG_SYS_NAND_READ_DELAY].

This fixes a compile breakage on kilauea_nand for example.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Scott Wood <scottwood@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

nand_spl/nand_boot.c

@@ -33,11 +33,8 @@ static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8
 	struct nand_chip *this = mtd->priv;
 	int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;
 
-	if (this->dev_ready)
-		while (!this->dev_ready(mtd))
-			;
-	else
-		CONFIG_SYS_NAND_READ_DELAY;
+	while (!this->dev_ready(mtd))
+		;
 
 	/* Begin command latch cycle */
 	this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);