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[Why] The status of various power features is often important information when debugging certain issues, such as underflow. This info helps to narrow down the potential sources of errors. [How] Add dc interface to capture power feature enablement status. Reviewed-by: Dillon Varone <dillon.varone@amd.com> Signed-off-by: George Shen <george.shen@amd.com> Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>