configs: ns3: enable FIT config

Enable FIT config for NS3.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/bcm_ns3_defconfig b/configs/bcm_ns3_defconfig
index ab26617..0e078f3 100644
--- a/configs/bcm_ns3_defconfig
+++ b/configs/bcm_ns3_defconfig
@@ -5,6 +5,11 @@
 CONFIG_ENV_SIZE=0x80000
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_OF_BOARD_SETUP=y
+CONFIG_FIT=y
+CONFIG_FIT_SIGNATURE=y
+CONFIG_FIT_SIGNATURE_MAX_SIZE=0x20000000
+CONFIG_FIT_VERBOSE=y
+CONFIG_LEGACY_IMAGE_FORMAT=y
 CONFIG_LOGLEVEL=7
 CONFIG_SILENT_CONSOLE=y
 CONFIG_SILENT_U_BOOT_ONLY=y