drm/amd/powerplay: drop redundant .set_min_dcefclk_deep_sleep API (v2)

It has exactly the same functionality as .set_deep_sleep_dcefclk.

V2: correct the macro name for better trace

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>