drm/amdgpu: add gfx support for GC 11.0.1

Add GC 11.0.1 gfx support to gfx11 implementation.

v2: squash in golden regs

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Aaron Liu <aaron.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>