pinctrl: renesas: r8a7790: Restore pin function sort order

Move the du* pin function where it belongs.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/f4eb545cedcd1a72f0f80ef85daf03e2e423e90f.1643199959.git.geert+renesas@glider.be