Move fdt_simplefb to boot/

This relates to booting, so move it there. Create a new Kconfig menu for
things related to devicetree fixup.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/boot/Kconfig b/boot/Kconfig
index 0a98f1e..39c51e9 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -1538,6 +1538,22 @@
 
 endmenu
 
+if OF_LIBFDT
+
+menu "Devicetree fixup"
+
+config FDT_SIMPLEFB
+	bool "FDT tools for simplefb support"
+	help
+	  Enable the fdt tools to manage the simple fb nodes in device tree.
+	  These functions can be used by board to indicate to the OS
+	  the presence of the simple frame buffer with associated reserved
+	  memory
+
+endmenu
+
+endif # OF_LIBFDT
+
 config USE_BOOTARGS
 	bool "Enable boot arguments"
 	help