arm64: dts: renesas: r8a779a0: Restore sort order

The thermal node was inserted at the wrong place, breaking sort order
(sort by unit address, but group nodes of the same type).

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/8d68a7ce449aaf90a88e69397dbe0e9c467d5726.1624460175.git.geert+renesas@glider.be