drm/amdgpu/discovery: use specific ip_discovery.bin for legacy asics

commit 25f602fb upstream.

vega10/vega12/vega20/raven/raven2/picasso/arcturus/aldebaran

Signed-off-by: Flora Cui <flora.cui@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Jonathan Gray <jsg@jsg.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>