powerpc/cputable: Remove unnecessary copy of cpu_spec->oprofile_type

Before checking for cpu_type == NULL, this same copy happens, so doing
it here will just write the same value to the t->oprofile_type
again.

Remove the repeated copy, as it is unnecessary.

Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200215053637.280880-1-leonardo@linux.ibm.com