parisc: Fix powerbutton on 64-bit kernel

As long as this is a 32-bit PDC, we can't access a powerbutton
in the firmware area when running on a 64-bit CPU.
Report that non-supportability when asked by PDC_SOFT_POWER by
a 64-bit kernel.
Qemu may want to use some address in page zero instead.

Signed-off-by: Helge Deller <deller@gmx.de>
1 file changed