rockchip: make_fit_atf: use correct fdt_x references in config nodes

The script iterates over the given devicetrees and creates both
fdt_x node as well as a conf-node for each passed dt.

But there is a slight bug in that it always references fdt_1 in each
conf node instead of the matching fdt_x as expected.

So fix that by referencing the number of the current dt similar to
how the fdt_x nodes gets created.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/make_fit_atf.py

@@ -107,7 +107,7 @@ def append_conf_section(file, cnt, dtname, segments):
             file.write(';\n')
     if segments <= 1:
         file.write(';\n')
-    file.write('\t\t\tfdt = "fdt_1";\n')
+    file.write('\t\t\tfdt = "fdt_%d";\n' % cnt)
     file.write('\t\t};\n')
     file.write('\n')