drm/amd/powerplay: remove enable_clock_power_gatings_tasks from initialize and resume events

Setting PG state this early would cause lock ups in the IP block
initialized functions.

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>