cluster device doumentation snapshot taken from qcom-6.1 branch commit 040e6d35b731 ("dt-bindings: Add documentation for cluster device"). Updates: - Rewritten in YAML format. Change-Id: I765a50dce03fa7ecdf2c0ba9ace7bbf671102017 Signed-off-by: Rashid Zafar <quic_rzafar@quicinc.com>