spl_fit. add hook to make fixes after fit header is loaded

add hook function spl_load_simple_fit_fix_load()
which is called after fit image header is loaded.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/spl.h

@@ -304,6 +304,14 @@ ulong spl_get_image_text_base(void);
  */
 bool spl_load_simple_fit_skip_processing(void);
 
+/**
+ * spl_load_simple_fit_fix_load() - Hook to make fixes
+ * after fit image header is loaded
+ *
+ * Returns pointer to fit
+ */
+void *spl_load_simple_fit_fix_load(const void *fit);
+
 /**
  * spl_load_simple_fit() - Loads a fit image from a device.
  * @spl_image:	Image description to set up