Revert "imx_common: Return MMCSD_MODE_FS in spl_boot_mode() also for EXTFS"

Commit c1ebf54868359005 ("imx_common: Return MMCSD_MODE_FS in spl_boot_mode()
also for EXTFS") causes SPL breakage on wandboard:

ERROR: v7_dcache_inval_range - start address is not aligned - 0x1820006c
ERROR: v7_dcache_inval_range - stop address is not aligned - 0x1820086c
ERROR: v7_dcache_inval_range - start address is not aligned - 0x1820006c
ERROR: v7_dcache_inval_range - stop address is not aligned - 0x1820086c
** First descriptor is NOT a primary desc on 0:1 **
spl: no partition table found
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

This error is seen when SPL and u-boot.img are stored in the raw SD card
partition.

This reverts commit c1ebf54868359005c32944c1473668d5fcaca158.

Signed-off-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/arch/arm/imx-common/spl.c b/arch/arm/imx-common/spl.c
index 0c1e401..bdcda7d 100644
--- a/arch/arm/imx-common/spl.c
+++ b/arch/arm/imx-common/spl.c
@@ -76,7 +76,7 @@
 	/* for MMC return either RAW or FAT mode */
 	case BOOT_DEVICE_MMC1:
 	case BOOT_DEVICE_MMC2:
-#if defined(CONFIG_SPL_FAT_SUPPORT) || defined(CONFIG_SPL_EXT_SUPPORT)
+#if defined(CONFIG_SPL_FAT_SUPPORT)
 		return MMCSD_MODE_FS;
 #elif defined(CONFIG_SUPPORT_EMMC_BOOT)
 		return MMCSD_MODE_EMMCBOOT;