dt-bindings: power: Add power-domain header for RV1126

Add power-domain header for RV1126 SoC from description in TRM.

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220818124132.125304-2-jagan@edgeble.ai


Signed-off-by: Heiko Stuebner <heiko@sntech.de>