drm/amdgpu: add atom_gfx_info_v3_0 structure

atomfirmware table used for newer gfx IPs.

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>