devicetree: bindings: r8a73a4 and R-Car Gen2 CMT bindings

Update SoC-specific bindings for r8a73a4 and R-Car Gen2 CMT0 and CMT1.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>