xics: pass appropriate types to realize() handlers.

xics: pass appropriate types to realize() handlers.

It makes more sense to pass an IPCState * to handlers of ICPStateClass
instead of a DeviceState *, if only to benefit from compile time type
checking. The same goes with ICSStateClass.

While here, we also change the declaration of ICPStateClass in xics.h
for consistency.

Signed-off-by: Greg Kurz <[email protected]>
Signed-off-by: David Gibson <[email protected]>