drm/amdgpu: add SMU 8.0 register headers

These are register headers for the SMU (System Management Unit)
block on the GPU.

Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --cc drivers/gpu/drm/amd/include/asic_reg/smu/smu_8_0_d.h
Simple merge

diff --cc drivers/gpu/drm/amd/include/asic_reg/smu/smu_8_0_enum.h
Simple merge

diff --cc drivers/gpu/drm/amd/include/asic_reg/smu/smu_8_0_sh_mask.h
Simple merge