aarch64: Update regmove costs for neoverse-v1 and neoverse-512tvb tunings

aarch64: Update regmove costs for neoverse-v1 and neoverse-512tvb tunings

This patch updates the register move tunings for
-mcpu/-mtune={neoverse-v1,neoverse-512tvb}.

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

	* config/aarch64/aarch64.cc (neoversev1_regmove_cost): New tuning
	struct.
	(neoversev1_tunings): Use neoversev1_regmove_cost and update store_int
	cost.
	(neoverse512tvb_tunings): Likewise.