dt-bindings: timer: renesas,tmu: Add r8a779f0 support

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220726205858.1199-1-wsa+renesas@sang-engineering.com


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