Remove support for /dev/port altogether.

1. It is not usable with ports which require 4 byte access.

2. The same can be achieved by using capabilities and su bits and so on.

3. __m68000__ doesn't even implement it and most other non i386 archs
"implement" it but apparently don't even care about endianess issues.

4. It's not standard.

5. seek() + port access is "racy" with respect to multiple usage.

6. Nothing is using it.

... and so on and so on ...

And finally, kernel size with it:

    text    data     bss     dec     hex filename
1480587  243280  259628 1983495  1e4407 vmlinux

kernel size without it:

[root@kozaczek linux]# size vmlinux
    text    data     bss     dec     hex filename
1480229  243184  259628 1983041  1e4241 vmlinux

Which means a saving of 454 bytes :-).