imx6ul: engicam: Drop isiot-mmc defconfig

Engicam Is.IoT has eMMC and NAND cpu modules where MMC
is common for both, so remove explicit mmc defconfig.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/configs/imx6ul_isiot_emmc_defconfig b/configs/imx6ul_isiot_emmc_defconfig
index c334beb..d91b944 100644
--- a/configs/imx6ul_isiot_emmc_defconfig
+++ b/configs/imx6ul_isiot_emmc_defconfig
@@ -23,6 +23,7 @@
 CONFIG_CRC32_VERIFY=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_GPIO=y
+CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
@@ -33,6 +34,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_ENV_IS_IN_MMC=y
+CONFIG_SYS_I2C_MXC=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_SMSC=y
 CONFIG_FEC_MXC=y