ARM: dts: r7s72100: sort subnodes of root node

Sort the subnodes of the soc node to improve maintainability.
The sort has been done alphabetically with the node name as the key.

This patch should not introduce any functional change.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>