drm/amd/pm: Make smu_v13_0_baco_set_armd3_sequence() static

smu_v13_0_baco_set_armd3_sequence is not used by other files, so
make it as static type.

Signed-off-by: Ma Jun <Jun.Ma2@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>