drm/amdgpu: unify the interface of amd_pm_funcs

put amd_pm_funcs table in struct powerplay for all
asics.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/si_dpm.h b/drivers/gpu/drm/amd/amdgpu/si_dpm.h
index 51ce21c..9fe343d 100644
--- a/drivers/gpu/drm/amd/amdgpu/si_dpm.h
+++ b/drivers/gpu/drm/amd/amdgpu/si_dpm.h
@@ -246,6 +246,7 @@ enum si_display_gap
 };
 
 extern const struct amd_ip_funcs si_dpm_ip_funcs;
+extern const struct amd_pm_funcs si_dpm_funcs;
 
 struct ni_leakage_coeffients
 {