MIPS: OCTEON: Delete unused COP2 saving code

MIPS: OCTEON: Delete unused COP2 saving code

Commit 0717a77293de ("MIPS: Move cop2 save/restore to switch_to()")
removes assembler code to store COP2 registers.  Commit
e9e27fd9b5c3 ("MIPS: OCTEON: Enable use of FPU") mistakenly
restores it

Fixes: e9e27fd9b5c3 ("MIPS: OCTEON: Enable use of FPU")
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: David Daney <david.daney@cavium.com>
Patchwork: https://patchwork.linux-mips.org/patch/8937/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>