lib: kconfig: Limit BINMAN_FDT for OF_SEPARATE or OF_EMBED

Generally speaking BINMAN_FDT makes sense for OF_SEPARATE or OF_EMBED.
For the other OF_CONTROL methods, it's quite possible binman node is
not available as binman is invoked during the build phase instead of
runtime. Let's only turn it on for OF_SEPARATE or OF_EMBED by default.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/Kconfig b/lib/Kconfig
index b057b9d..d675ab1 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -25,7 +25,7 @@
 config BINMAN_FDT
 	bool "Allow access to binman information in the device tree"
 	depends on BINMAN && DM && OF_CONTROL
-	default y
+	default y if OF_SEPARATE || OF_EMBED
 	help
 	  This enables U-Boot to access information about binman entries,
 	  stored in the device tree in a binman node. Typical uses are to