hw/i386: split PCMachineState deriving X86MachineState from it

Split up PCMachineState and PCMachineClass and derive X86MachineState
and X86MachineClass from them. This allows sharing code with non-PC
x86 machine types.

Signed-off-by: Sergio Lopez <slp@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c
index 1ede055..ead14e1 100644
--- a/hw/intc/ioapic.c
+++ b/hw/intc/ioapic.c
@@ -89,7 +89,7 @@
 
 static void ioapic_service(IOAPICCommonState *s)
 {
-    AddressSpace *ioapic_as = PC_MACHINE(qdev_get_machine())->ioapic_as;
+    AddressSpace *ioapic_as = X86_MACHINE(qdev_get_machine())->ioapic_as;
     struct ioapic_entry_info info;
     uint8_t i;
     uint32_t mask;