MX51evk: Removed warnings

Changes reflect modifications in the fsl_esdhc driver
(the clk_enable field war removed in the configuration structure).

Signed-off-by: Stefano Babic <sbabic@denx.de>

board/freescale/mx51evk/mx51evk.c

@@ -39,8 +39,8 @@ struct io_board_ctrl *mx51_io_board;
 
 #ifdef CONFIG_FSL_ESDHC
 struct fsl_esdhc_cfg esdhc_cfg[2] = {
-	{MMC_SDHC1_BASE_ADDR, 1, 1},
-	{MMC_SDHC2_BASE_ADDR, 1, 1},
+	{MMC_SDHC1_BASE_ADDR, 1},
+	{MMC_SDHC2_BASE_ADDR, 1},
 };
 #endif