configs: imx6dl-mamoj: Add DFU support

Add DFU support for BTicino Mamoj board and update
the same steps in README.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Simone CIANNI <simone.cianni@bticino.it>
Signed-off-by: Raffaele RECALCATI <raffaele.recalcati@bticino.it>
diff --git a/configs/imx6dl_mamoj_defconfig b/configs/imx6dl_mamoj_defconfig
index 0827207..e34c2d9 100644
--- a/configs/imx6dl_mamoj_defconfig
+++ b/configs/imx6dl_mamoj_defconfig
@@ -15,6 +15,7 @@
 CONFIG_FASTBOOT_FLASH_MMC_DEV=2
 CONFIG_SYS_PROMPT="=> "
 CONFIG_CRC32_VERIFY=y
+CONFIG_CMD_DFU=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
@@ -44,5 +45,6 @@
 CONFIG_USB_GADGET_VENDOR_NUM=0x0525
 CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
 CONFIG_CI_UDC=y
+CONFIG_DFU_MMC=y
 CONFIG_IMX_THERMAL=y
 CONFIG_SYS_I2C_MXC=y