[arm] Remove remaining references to arm feature sets

[arm] Remove remaining references to arm feature sets

Nothing uses the old feature sets now, so we can delete them entirely.

	* arm-cores.def: Remove FLAGS field from all core definitions.
	* arm-arches.def: Likewise.
	* arm-opts.h (enum processor_type): Remove FLAGS parameter from
	ARM_CORES macro.
	(arm_arch_core_flags): Likewise, plus ARM_ARCH macro.
	* arm-protos.h (FL_*): Delete.
	(arm_feature_set): Delete.
	(ARM_FSET_*): Delete.
	* arm.c (struct processors): Delete flags field.
	(all_cores): Delete FLAGS parameter from macro, don't initialize flags.
	(all architectures): Likewise.

From-SVN: r243705