arc: Update opcode related include files for ARCv3.

Add new ARCv3 CPUs and required bits to decode/encode ARCv3 ISA
opcodes. Fix 32 bit relocations which were set as signed but should be
bitfield: ARC_32_ME, ARC_GLOB_DAT, ARC_JMP_SLOT, ARC_RELATIVE. Remove
non-ABI relocation ARC_32_ME_S.

include/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>
	    Cupertino Miranda  <cupertinomiranda@gmail.com>
	    Bruno Mauricio <brunoasmauricio@gmail.com>

	* include/elf/arc-cpu.def: Add new HS5x and HS6x CPUs.
	* include/elf/arc-reloc.def: Add new ARC64 relocations.
	* include/elf/arc.h (EF_ARC_CPU_ARC64): New define.
	* include/opcode/arc-attrs.h (FEATURE_LIST_NAME): Update predicate.
	* include/opcode/arc-func.h: Update formating.
	(replace_disp8ls): New function.
	(replace_disp9s): Likewise.
	(replace_disp6s): Likewise.
	(replace_disp7s): Likewise.
	(replace_disp12s): Likewise.
	* include/opcode/arc.h (ARC_OPCODE_ARC64): New define.
	(ARC_OPCODE_ARC32): Likewise.
	(ARC_OPERAND_FP): Likewise.
	(HARD_FIELDF): Likewise.
	(ARC_OPCODE_ARCVx): New macro.
	(arc_flag_class): Update structure to hold new extract/insert
	functions for flags.
	(INSN3OP): Update macro.
	(FP_SIZE, TPOF, DPOF, SOPF, COPF, CONVOPS): New enums.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>