mx7dsabre: Remove warning about DM_SPI_FLASH

This defconfig doesn't need it.

Signed-off-by: Joris Offouga <offougajoris@gmail.com>
diff --git a/configs/mx7dsabresd_defconfig b/configs/mx7dsabresd_defconfig
index 883f21f..d15de38 100644
--- a/configs/mx7dsabresd_defconfig
+++ b/configs/mx7dsabresd_defconfig
@@ -51,9 +51,6 @@
 CONFIG_MMC_UHS_SUPPORT=y
 CONFIG_MMC_HS200_SUPPORT=y
 CONFIG_FSL_USDHC=y
-CONFIG_MTD=y
-CONFIG_SPI_FLASH=y
-CONFIG_SPI_FLASH_EON=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_BROADCOM=y
 CONFIG_DM_ETH=y