bios_emulator: for non-x86, print warnings if PM_{inp, outp}* access is attempted

bios_emulator: for non-x86, print warnings if PM_{inp, outp}* access is attempted

Currently the PM_{inp,outp}* macros are completely broken on non-x86 architectures,
because they will essentially access random memory locations if called (and produce
a lot of rightful compilation warnings too). For now, replace those macros with
warnings (until the code is fixed), so the user at least knows that the emulator
attempted to access some x86 I/O port.

Signed-off-by: Yuri Zaporozhets <yuriz@qrv-systems.net>