aarch64: update error message format.

aarch64: update error message format.

Use 'qs' and remove usage '(%qs)'.

	PR target/104898

gcc/ChangeLog:

	* config/aarch64/aarch64.cc (aarch64_handle_attr_arch):
	Use 'qs' and remove usage '(%qs)'.
	(aarch64_handle_attr_cpu): Likewise.
	(aarch64_handle_attr_tune): Likewise.
	(aarch64_handle_attr_isa_flags): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/branch-protection-attr.c:
	Use 'qs' and remove usage '(%qs)'.
	* gcc.target/aarch64/spellcheck_1.c: Likewise.
	* gcc.target/aarch64/spellcheck_2.c: Likewise.
	* gcc.target/aarch64/spellcheck_3.c: Likewise.