[RFC] Add lspnp support for sysfs

[Komuro]

Hello,

I want 'check_pnp_irq' api in the kernel pnp layer.
to avoid irq conflict between 16bit-pcmcia card
and on-board pnp-devices.

for example,
int check_pnp_irq(int irq)
  return  0 (unused)
         -1 (used)
         -2 (reserved)
 
Below is a known problems and limitations
in the pcmcia-cs README-2.4

>  The kernel PCMCIA package cannot be configured to use PnP BIOS calls
>  for resource management.  Recent kernels do have PnP BIOS support
>  but the "glue" hasn't been written.


Best Regards
Komuro