MIPS: Push ARCH_MIGHT_HAVE_PC_PARPORT down to platform level

Maybe once upon a time the select of ARCH_MIGHT_HAVE_PC_PARPORT used to
make sense.  These days MIPS platforms long have done away with parallel
ports and embedded systems probably never had one anyway so push the
select down to the level of individual platforms.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: James Hogan <jhogan@kernel.org>