Fix -Wformat-diag for ARM target.

Fix -Wformat-diag for ARM target.

gcc/ChangeLog:

	* common/config/arm/arm-common.c (arm_target_mode): Wrap
	keywords with %<, %> and remove trailing punctuation char.
	(arm_canon_arch_option_1): Likewise.
	(arm_asm_auto_mfpu): Likewise.
	* config/arm/arm-builtins.c (arm_expand_builtin): Likewise.
	* config/arm/arm.c (arm_options_perform_arch_sanity_checks): Likewise.
	(use_vfp_abi): Likewise.
	(aapcs_vfp_is_call_or_return_candidate): Likewise.
	(arm_handle_cmse_nonsecure_entry): Likewise.
	(arm_handle_cmse_nonsecure_call): Likewise.
	(thumb1_md_asm_adjust): Likewise.