Use forward declaration in amdgpu_dm.h for struct dc instand
of include dc.h to make header files more standalone
Reviewed-by: NHarry Wentland <harry.wentland@amd.com>
Signed-off-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>