arc/nps400: Add cp16/cp32 instructions to opcodes library

arc/nps400: Add cp16/cp32 instructions to opcodes library

Instructions for loading or storing 16/32B data from one address type to
another.

gas/ChangeLog

	* testsuite/gas/arc/nps400-11.s: New file.
	* testsuite/gas/arc/nps400-11.d: New file.

include/ChangeLog

	* opcode/arc.h (insn_class_t): Add DMA class.

opcodes/ChangeLog

	* arc-nps400-tbl.h: Add cp32/cp16 instructions format.
	* arc-opc.c: Add F_NPS_NA, NPS_DMA_IMM_ENTRY, NPS_DMA_IMM_OFFSET.
	(insert_nps_imm_offset): New function.
	(extract_nps_imm_offset): New function.
	(insert_nps_imm_entry): New function.
	(extract_nps_imm_entry): New function.