KVM: x86/xen: Remove the redundantly included header file lapic.h

The header lapic.h is included more than once, remove one of them.

Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220406063715.55625-2-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>