hw/xen: Add evtchn operations to allow redirection to internal emulation

The existing implementation calling into the real libxenevtchn moves to
a new file hw/xen/xen-operations.c, and is called via a function table
which in a subsequent commit will also be able to invoke the emulated
event channel support.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>

hw/xen/meson.build

@@ -5,6 +5,7 @@ softmmu_ss.add(when: ['CONFIG_XEN', xen], if_true: files(
   'xen-legacy-backend.c',
   'xen_devconfig.c',
   'xen_pvdev.c',
+  'xen-operations.c',
 ))
 
 xen_specific_ss = ss.source_set()