binutils commit 5fbec329 changed disassembly of mfvsrd and mtvsrd
to be consistent with the mfvsrwz and mtvsrw/mtvsrwz, which favour
output of the fp/vr extended mnemonic and regs over the vsx form.
This patch fixes the following, and removes some duplicates.

FAIL: gdb.arch/powerpc-power8.exp: found: mfvsrd  r12,vs62
FAIL: gdb.arch/powerpc-power8.exp: found: mtvsrd  vs48,r11
FAIL: gdb.arch/powerpc-vsx2.exp: found: mfvsrd  r12,vs30
FAIL: gdb.arch/powerpc-vsx2.exp: found: mfvsrd  r12,vs30
FAIL: gdb.arch/powerpc-vsx2.exp: found: mfvsrd  r12,vs62
FAIL: gdb.arch/powerpc-vsx2.exp: found: mfvsrd  r12,vs62
FAIL: gdb.arch/powerpc-vsx2.exp: found: mtvsrd  vs11,r28
FAIL: gdb.arch/powerpc-vsx2.exp: found: mtvsrd  vs11,r28
FAIL: gdb.arch/powerpc-vsx2.exp: found: mtvsrd  vs43,r29
FAIL: gdb.arch/powerpc-vsx2.exp: found: mtvsrd  vs43,r29

	* gdb.arch/powerpc-altivec.s,
	* gdb.arch/powerpc-power7.s,
	* gdb.arch/powerpc-power8.s,
	* gdb.arch/powerpc-power9.s,
	* gdb.arch/powerpc-vsx.s,
	* gdb.arch/powerpc-vsx2.s: Remove duplicate instructions.
	* gdb.arch/powerpc-altivec.exp,
	* gdb.arch/powerpc-power7.exp,
	* gdb.arch/powerpc-power8.exp,
	* gdb.arch/powerpc-power9.exp,
	* gdb.arch/powerpc-vsx.exp,
	* gdb.arch/powerpc-vsx2.exp: Likewise, and update expected
	disassembly of mfvsrd/mtvsrd.