x86_cpu_dump_local_apic_state() is called from monitor.c which
is only compiled for system emulation since commit bf957284
("monitor: remove target-specific code from monitor.c").

Interestingly this stub was added few weeks later in commit
1f871d49 ("hmp: added local apic dump state") and was not
necessary by that time.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221216220158.6317-5-philmd@linaro.org>