drm/amd/pm: Move some functions to smu_v13_0.c as generic code

Use generic functions and remove the duplicate code

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>