hpet: enable to entitle more irq pins for hpet
Owning to some different hardware design, piix and q35 need different compat. So making them diverge. On q35, IRQ2/8 can be reserved for hpet timer 0/1. And pin 16~23 can be assigned to hpet as guest chooses. So we introduce intcap property to do that. Consider the compat and piix/q35, we finally have the following value for intcap: For piix, hpet's intcap is hard coded as IRQ2. For pc-q35-1.7 and earlier, we use IRQ2 for compat reason. Otherwise IRQ2, IRQ8, and IRQ16~23 are allowed. Signed-off-by: NLiu Ping Fan <pingfank@linux.vnet.ibm.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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