boot_fit: Create helper functions that can be used to select DTB out of FIT

Some platforms may append a FIT image to the U-boot image. This function
aids in parsing the FIT image and selecting the correct DTB at runtime.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/common/Kconfig b/common/Kconfig
index 27dde11..a5e3a6b 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -437,6 +437,13 @@
 
 endmenu
 
+config FIT_EMBED
+	bool "Support a FIT image embedded in the U-boot image"
+	help
+	  This option provides hooks to allow U-boot to parse an
+	  appended FIT image and enable board specific code to then select
+	  the correct DTB to be used.
+
 config DEFAULT_FDT_FILE
 	string "Default fdt file"
 	help