drm/amd/powerplay: move smu types to smu_types.h

move some enum type (message, feature, clock) to smu_types.h.
these types is too long in amdgpu_smu.h, and not clearly.

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>