anv: Int64 atomics don't need to depend on softpin

Ever since 04ccfeae98f2 ("anv: Require softpin on Gen8+"), softpin has
been a hard requirement on BDW+ so there's no reason for SKL+ code to
have a relocation path.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13610>
1 file changed