MIPS: smp-cmp: Remove incorrect core number probe

This probing is already done by decode_configs as part of cpu_probe, and
furthermore the implementation here was incorrect for any MT core with
a number of VPEs other than 2.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6650/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>