drm/amd/smu: unify smu ppt callback macros

v1: add the new macro "smu_ppt_xxx()" to unify smu callback interfaces
v2: rename the macro smu_ppt_xxx to smu_ppt_funcs.

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>