drm/amd/powerplay: delete SMUM_WAIT_INDIRECT_FIELD

repeated defining in hwmgr.h
use PHM_WAIT_INDIRECT_FIELD instand.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>