dt-bindings: thermal: rcar-gen3-thermal: Add r8a779g0 support

Document support for the Thermal Sensor/Chip Internal Voltage
Monitor/Core Voltage Monitor (THS/CIVM/CVM) on the Renesas R-Car V4H
(R8A779G0) SoC.

Unlike most other R-Car Gen3 and Gen4 SoCs, it has 4 instead of 3
sensors, so increase the maximum number of reg tuples.
Just like other R-Car Gen4 SoCs, interrupts are not routed to the
INTC-AP but to the ECM.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/11f740522ec479011cc8eef6bb450603be394def.1675958665.git.geert+renesas@glider.be
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>