It has exactly the same functionality as .set_deep_sleep_dcefclk.

V2: correct the macro name for better trace
Signed-off-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>