opcodes int vs bfd_boolean fixes

cpu/
	* frv.opc (frv_is_branch_major, frv_is_float_major),
	(frv_is_media_major, frv_is_branch_insn, frv_is_float_insn),
	(frv_is_media_insn, spr_valid): Correct prototypes.
include/
	* opcode/aarch64.h (aarch64_opcode_encode): Correct prototype.
opcodes/
	* arc-dis.c (extract_operand_value): Correct NULL cast.
	* frv-opc.h: Regenerate.