Move copy_u.w to MSA64 ASE, remove copy_u.d.

Move copy_u.w to MSA64 ASE, remove copy_u.d.

opcodes/ChangeLog:

	* mips-opc.c (mips_builtin_opcodes): Change "copy_u.w" to MSA64 ASE,
	remove "copy_u.d".

gas/testsuite/ChangeLog:

	* gas/mips/micromips@msa.d: Remove "copy_u.w".
	* gas/mips/msa.d: Likewise.
	* gas/mips/msa.s: Likweise.
	* gas/mips/mipsr6@msa.d: Likewise.  Replace addresses with regex.
	* gas/mips/msa64.d: Add "copy_u.w".  Remove "copy_u.d".
	* gas/mips/msa64.s: Likewise.
	* gas/mips/micromips@msa64.d: Likewise.