aarch64: Add Neoverse-N2 tuning structs

This patch adds tuning structures for Neoverse N2.

2022-03-22  Tamar Christina  <tamar.christina@arm.com>
	    Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* config/aarch64/aarch64.cc (neoversen2_addrcost_table,
	neoversen2_regmove_cost, neoversen2_advsimd_vector_cost,
	neoversen2_sve_vector_cost, neoversen2_scalar_issue_info,
	neoversen2_advsimd_issue_info, neoversen2_sve_issue_info,
	neoversen2_vec_issue_info, neoversen2_tunings): New structs.
	(neoversen2_tunings): Use new structs and update tuning flags.
	(aarch64_vec_op_count::rename_cycles_per_iter): Enable for neoversen2
	tuning.