dt-bindings: timer: renesas,cmt: Fix R-Car Gen4 fall-out

Restore sort order (by family, followed by type).
Update the conditional sections specifying the number of interrupts.

Fixes: 525b2961 ("dt-bindings: timer: renesas,cmt: Add r8a779f0 and generic Gen4 CMT support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/2e3863ae32e17d49f41111580f195dd34e2b769d.1658303544.git.geert+renesas@glider.be


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>