drm/amdgpu: fix cyan_skillfish2 gpu info fw handling
If the board supports IP discovery, we don't need to
parse the gpu info firmware.
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4721
Fixes: fa819e3a7c1e ("drm/amdgpu: add support for cyan skillfish gpu_info")
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>