KVM: x86/xen: Convert evtchn_ports from IDR to XArray

IDR is deprecated in favor of XArray: see
Documentation/core-api/idr.rst. Convert evtchn_ports accordingly.

kvm_xen_eventfd_assign()'s single-slot idr_alloc() becomes
xa_insert(), since it was really an insert-at-index, not an
allocation: -EBUSY replaces -ENOSPC, still mapped to -EEXIST.

kvm_xen_hcall_evtchn_send() drops its explicit rcu_read_lock(),
since xa_load() takes its own RCU read-side section internally.
evtchnfd's lifetime is still guaranteed by kvm->srcu.

xen_lock is left in place: it protects state beyond the map itself.

Signed-off-by: Furkan Caliskan <frn1furkan10@gmail.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
Link: https://patch.msgid.link/20260831213632.81023-14-dwmw2@infradead.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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