pico-imx7d: Add default DFU targets

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/configs/pico-imx7d_defconfig b/configs/pico-imx7d_defconfig
index e456aed..04823ca 100644
--- a/configs/pico-imx7d_defconfig
+++ b/configs/pico-imx7d_defconfig
@@ -9,6 +9,7 @@
 # CONFIG_CMD_BOOTD is not set
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_XIMG is not set
+CONFIG_CMD_DFU=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y
@@ -19,7 +20,7 @@
 # CONFIG_CMD_MII is not set
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT4_WRITE=y
-# CONFIG_ISO_PARTITION is not set
+CONFIG_DFU_MMC=y
 CONFIG_FSL_ESDHC=y
 CONFIG_PHYLIB=y
 CONFIG_USB=y