spl: Add a way for boards to select which device tree to load

SPL calls this function with each device tree it can find in the FIT. The
board should implement this function, using whatever hardware detection it
can muster to determine the correct device tree.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/image.h

@@ -1154,4 +1154,17 @@ ulong android_image_get_kload(const struct andr_img_hdr *hdr);
 
 #endif /* CONFIG_ANDROID_BOOT_IMAGE */
 
+/**
+ * board_fit_config_name_match() - Check for a matching board name
+ *
+ * This is used when SPL loads a FIT containing multiple device tree files
+ * and wants to work out which one to use. The description of each one is
+ * passed to this function. The description comes from the 'description' field
+ * in each (FDT) image node.
+ *
+ * @name: Device tree description
+ * @return 0 if this device tree should be used, non-zero to try the next
+ */
+int board_fit_config_name_match(const char *name);
+
 #endif	/* __IMAGE_H__ */