dt-bindings: arm: merge qcom,idle-state with idle-state

Merge Qualcomm-specific idle-state binding with generic one.

Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://lore.kernel.org/r/20231202234832.155306-1-david@ixit.cz


Signed-off-by: Rob Herring <robh@kernel.org>