Commit 
abe11ddea1d7 ("ARC: [plat-arcfpga]: Enabling DeviceTree for
Angel4 board") changed the default built-in DTB from "skeleton" to
"angel4".
Commit 
fd1557923b2e ("ARC: [plat_arcfpga]->[plat_sim]") changed it
from "angel4" to "nsim_700".
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Vineet Gupta <vgupta@kernel.org>
        string "Built in DTB"
        help
          Set the name of the DTB to embed in the vmlinux binary
-         Leaving it blank selects the minimal "skeleton" dtb
+         Leaving it blank selects the "nsim_700" dtb.
 
 endmenu         # "ARC Architecture Configuration"