drm/amd/pm: enable ac/dc switching for SMU 13.0.0

Fulfill the ->set_power_source interface which notifies
PMFW the current system power source(AC/DC).

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>