[POWERPC] Fix interrupt distribution in ppc970

[POWERPC] Fix interrupt distribution in ppc970

In some of the PPC970 based systems, interrupt would be distributed to
offline cpus also even when booted with "maxcpus=1".  So check whether
cpu online map and cpu present map are equal or not.  If they are equal
default_distrib_server is used as interrupt server otherwise boot cpu
(default_server) used as interrupt server.

In addition to this, if an interrupt is assigned to a specific cpu (ie
smp affinity) and if that cpu is not online, the earlier code used to
return the default_distrib_server as interrupt server.  This
introduces an additional parameter to the get_irq function, called
strict_check.  Based on this parameter, if the cpu is not online
either default_distrib_server or -1 is returned.

Signed-off-by: Mohan Kumar M <[email protected]>
Cc: Michael Ellerman <[email protected]>
Acked-by: Milton Miller <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>