powerpc/t4240rdb: enable eSDHC 3.3V support

The SD supply Voltage was 3.3V on T4240RDB, so enabled 3.3V support for eSDHC.

Signed-off-by: Xie Xiaobo <X.Xie@freescale.com>
Signed-off-by: Wujie Qiu <B49553@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

include/configs/T4240RDB.h

@@ -690,6 +690,7 @@ unsigned long get_board_ddr_clk(void);
 #define CONFIG_CMD_EXT2
 #define CONFIG_CMD_FAT
 #define CONFIG_DOS_PARTITION
+#define CONFIG_SYS_FSL_MMC_HAS_CAPBLT_VS33
 #endif
 
 /* Hash command with SHA acceleration supported in hardware */