vbe: Allow VBE to disable adding loadables to the FDT

When VBE operates within VPL it does not want the FDT to be changed.
Provide a way to disable this feature.

Move the FIT_IMAGE_TINY condition out of spl_fit_record_loadable() so
that both conditions are together. This makes the code easier to
understand.

Replace the existing fit_loaded member, which is no-longer used.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/spl.h b/include/spl.h
index 7155e9c..850c64d 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -345,7 +345,7 @@
  * @priv: Private data for the device
  * @bl_len: Block length for reading in bytes
  * @phase: Image phase to load
- * @fit_loaded: true if the FIT has been loaded, except for external data
+ * @no_fdt_update: true to update the FDT with any loadables that are loaded
  */
 struct spl_load_info {
 	spl_load_reader read;
@@ -355,7 +355,7 @@
 #endif
 #if CONFIG_IS_ENABLED(BOOTMETH_VBE)
 	u8 phase;
-	u8 fit_loaded;
+	u8 fdt_update;
 #endif
 };
 
@@ -395,12 +395,20 @@
 #endif
 }
 
-static inline bool xpl_get_fit_loaded(struct spl_load_info *info)
+static inline void xpl_set_fdt_update(struct spl_load_info *info,
+				      bool fdt_update)
 {
 #if CONFIG_IS_ENABLED(BOOTMETH_VBE)
-	return info->fit_loaded;
+	info->fdt_update = fdt_update;
+#endif
+}
+
+static inline enum image_phase_t xpl_get_fdt_update(struct spl_load_info *info)
+{
+#if CONFIG_IS_ENABLED(BOOTMETH_VBE)
+	return info->fdt_update;
 #else
-	return false;
+	return true;
 #endif
 }
 
@@ -415,6 +423,7 @@
 	load->priv = priv;
 	spl_set_bl_len(load, bl_len);
 	xpl_set_phase(load, IH_PHASE_NONE);
+	xpl_set_fdt_update(load, true);
 }
 
 /*