drm/amd/powerplay: Unify smu handle task function (v2)

drm/amd/powerplay: Unify smu handle task function (v2)

Unify power stade adjust function into smu_handle_task by the judgment
of task_id.
Move functions which have no relationship with smu version into the file
of amdgpu_smu.
Modified the function of smu_display_config_changed into two part.
Unify some similiar function.

v2: Correct the operation of upload dpm level when force dpm limit value.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>