Revert "drm/amd/powerplay: avoid using pm_en before it is initialized"

This reverts commit c5207876.

The commit being reverted changed the wrong place, it should have
changed in func get_asic_baco_capability.

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