i.MX31: Fix IOMUX related typos

Correct the names of some IOMUX macros.

Signed-off-by: Magnus Lilja <lilja.magnus@gmail.com>
diff --git a/board/imx31_litekit/imx31_litekit.c b/board/imx31_litekit/imx31_litekit.c
index 263dd9f..8cbc26e 100644
--- a/board/imx31_litekit/imx31_litekit.c
+++ b/board/imx31_litekit/imx31_litekit.c
@@ -50,7 +50,7 @@
 	mx31_gpio_mux(MUX_RXD1__UART1_RXD_MUX);
 	mx31_gpio_mux(MUX_TXD1__UART1_TXD_MUX);
 	mx31_gpio_mux(MUX_RTS1__UART1_RTS_B);
-	mx31_gpio_mux(MUX_RTS1__UART1_CTS_B);
+	mx31_gpio_mux(MUX_CTS1__UART1_CTS_B);
 
 	/* SPI2 */
 	mx31_gpio_mux((MUX_CTL_FUNC << 8) | MUX_CTL_CSPI2_SS2);