drm/amdgpu: Add gpu_info firmware for vega20. (v2)

vega20_gpu_info firmware stores gpu configuration for vega20.

v2: drop gpu info firmware for vega20

Squash of:
drm/amdgpu: Add gpu_info firmware for vega20.
drm/amdgpu: drop gpu_info firmware for vega20

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>