db410c: add FIT support

1. Add FIT support for DB410c defconfig.
2. Don't overwrite bootargs (they're already
   defined in Linux device tree for DB410c.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
diff --git a/configs/dragonboard410c_defconfig b/configs/dragonboard410c_defconfig
index ae8a8da..25137f9 100644
--- a/configs/dragonboard410c_defconfig
+++ b/configs/dragonboard410c_defconfig
@@ -4,9 +4,8 @@
 CONFIG_IDENT_STRING="\nQualcomm-DragonBoard 410C"
 CONFIG_DEFAULT_DEVICE_TREE="dragonboard410c"
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_FIT=y
 CONFIG_OF_BOARD_SETUP=y
-CONFIG_USE_BOOTARGS=y
-CONFIG_BOOTARGS="console=ttyMSM0,115200n8"
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_SYS_PROMPT="dragonboard410c => "