dt-bindings: bluetooth: qcom,wcn6750-bt: Deprecate old supplies

dt-bindings: bluetooth: qcom,wcn6750-bt: Deprecate old supplies

Commit cca4fe34979a ("dt-bindings: bluetooth: Utilize PMU abstraction
for WCN6750") changed the binding to new description with a Power
Management Unit (PMU), thus certain power-controller properties are
considered deprecated and are part of that PMUs binding.

Deprecate them to mark clearly that new PMU-based approach is preferred.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>