aarch64: Refactor infrastructure for advsimd intrinsics

aarch64: Refactor infrastructure for advsimd intrinsics

This patch refactors the infrastructure for defining advsimd pragma
intrinsics, adding support for more flexible type and signature
handling in future SIMD extensions.

A new simd_type structure is introduced, which allows for consistent
mode and qualifier management across various advsimd operations.

gcc/ChangeLog:

	* config/aarch64/aarch64-builtins.cc (ENTRY): Modify to
	include modes and qualifiers for simd_type structure.
	(ENTRY_VHSDF): Move to aarch64-builtins.cc to decouple.
	(struct simd_type): New structure for managing mode and
	qualifier combinations for SIMD types.
	(struct aarch64_pragma_builtins_data): Replace mode with
	simd_type to support multiple argument types for intrinsics.
	(aarch64_fntype): Modify to handle different shapes type.
	(aarch64_expand_pragma_builtin): Modify to handle different
	shapes type.

	* config/aarch64/aarch64-simd-pragma-builtins.def (ENTRY_BINARY):
	Move from aarch64-builtins.cc.
	(ENTRY_VHSDF): Move from aarch64-builtins.cc.
	(REQUIRED_EXTENSIONS): New macro.