drm/amdgpu: update atombios.h (v2)

update to internal version 893

v2: Pull in gfx_info changes from 898

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