drm/amdgpu/discovery: optionally use fw based ip discovery

[ Upstream commit 80a0e828 ]

On chips without native IP discovery support, use the fw binary
if available, otherwise we can continue without it.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Flora Cui <flora.cui@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 73eab787 ("drm/amd: Adjust output for discovery error handling")
Signed-off-by: Sasha Levin <sashal@kernel.org>