drm/amd/pm: add gfx_state_change_set() for rn gfx power switch (v2)

The gfx_state_change_set() funtion can support set GFX power
change status to D0/D3.

v2: make sure to register callback (Alex)

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