ARM: dts: r8a7743: Fix sorting of rwdt node

Watchdog node is incorrectly placed on r8a7743 SoC dtsi. This patch fixes
the sorting order.

Fixes: b5beb5d4 ("ARM: dts: r8a7743: Add watchdog support to SoC dtsi")

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>