dt-bindings: regulator: max77541: Add ADI MAX77541/MAX77540 Regulator

Add ADI MAX77541/MAX77540 Regulator devicetree document.

Signed-off-by: Okan Sahin <okan.sahin@analog.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230412111256.40013-2-okan.sahin@analog.com


Signed-off-by: Lee Jones <lee@kernel.org>