x86_32: apic/bigsmp_32, de-inline functions

The ones which go only into struct apic are de-inlined
by compiler anyway, so remove the inline specifier from them.

Afterwards, remove bigsmp_setup_portio_remap completely as it
is unused.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>