boot: Join FDT_FIXUP_PARTITIONS with related options

Move this to be with the other devicetree-fixup options.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/boot/Kconfig b/boot/Kconfig
index 2dd05e2..a1592a7 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -1475,6 +1475,14 @@
 	  incorrect when used with device tree as this option does not
 	  exist / should not be used.
 
+config FDT_FIXUP_PARTITIONS
+	bool "overwrite MTD partitions in DTS through defined in 'mtdparts'"
+	depends on CMD_MTDPARTS
+	help
+	  Allow overwriting defined partitions in the device tree blob
+	  using partition info defined in the 'mtdparts' environment
+	  variable.
+
 config FDT_SIMPLEFB
 	bool "FDT tools for simplefb support"
 	help