The timer node does not have any register properties and thus shouldn't be
placed on the bus.

This problem is flagged by the compiler as follows:
$ make dtbs W=1
...
  DTC     arch/arm/boot/dts/r8a7792-wheat.dtb
arch/arm/boot/dts/r8a7792-blanche.dtb: Warning (simple_bus_reg): Node /soc/timer missing or empty reg/ranges property
arch/arm/boot/dts/r8a7792-wheat.dtb: Warning (simple_bus_reg): Node /soc/timer missing or empty reg/ranges property
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>