dt-bindings: thermal: rcar-gen3-thermal: Add r8a779h0 support

Document support for the Thermal Sensor/Chip Internal Voltage
Monitor/Core Voltage Monitor (THS/CIVM/CVM) on the Renesas R-Car V4M
(R8A779H0) SoC.

Just like on other R-Car Gen4 SoCs, interrupts are not routed to the
INTC-AP (GIC) but to the Error Control Module (ECM).

Signed-off-by: Duy Nguyen <duy.nguyen.rh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/b3d135f8b63b9fe2d0f0aa2e48c8a2211b2e947e.1709722342.git.geert+renesas@glider.be