nios2: Enable support for fitImage

The uImage format is legacy for years now, enable support for the
fitImage format, which allows combining multiple files (kernel and
dtb) into a single file, offers better protection of the payload
and so on.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
diff --git a/configs/3c120_defconfig b/configs/3c120_defconfig
index 8bc13f3..9d249c7 100644
--- a/configs/3c120_defconfig
+++ b/configs/3c120_defconfig
@@ -3,6 +3,7 @@
 CONFIG_DM_SERIAL=y
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="3c120_devboard"
+CONFIG_FIT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_CPU=y
 # CONFIG_CMD_BOOTD is not set