sunxi: SPL: add FIT config selector for Pine64 boards

For a board or platform to support FIT loading in the SPL, it has to
provide a board_fit_config_name_match() routine, which helps to select
one of possibly multiple DTBs contained in a FIT image.
Provide a simple function which chooses the DT name U-Boot was
configured with.
If the DT name is one of the two Pine64 versions, determine the exact
model by checking the DRAM size.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Tested-by: Jagan Teki <jagan@openedev.com>

board/sunxi/board.c

@@ -757,3 +757,26 @@ int ft_board_setup(void *blob, bd_t *bd)
 #endif
 	return 0;
 }
+
+#ifdef CONFIG_SPL_LOAD_FIT
+int board_fit_config_name_match(const char *name)
+{
+	const char *cmp_str;
+
+#ifdef CONFIG_DEFAULT_DEVICE_TREE
+	cmp_str = CONFIG_DEFAULT_DEVICE_TREE;
+#else
+	return 0;
+#endif
+
+/* Differentiate the two Pine64 board DTs by their DRAM size. */
+	if (strstr(name, "-pine64") && strstr(cmp_str, "-pine64")) {
+		if ((gd->ram_size > 512 * 1024 * 1024))
+			return !strstr(name, "plus");
+		else
+			return !!strstr(name, "plus");
+	} else {
+		return strcmp(name, cmp_str);
+	}
+}
+#endif