the Pio type is duplicated between libutils and kernel

[kitlith]

in libutils: https://github.com/sunriseos/SunriseOS/blob/32729a6464bb0292f33831922a8962fbde65cafb/libutils/src/io/pio.rs

in kernel: https://github.com/sunriseos/SunriseOS/blob/e361007f79a7ede01410c738fa90bd85ba0b63a5/kernel/src/i386/pio.rs

These files seem to be almost identical, differing in comments and a single import. We probably want to make kernel use the one in libutils.