cpu-target: don't set cpu->thread_id to bogus value

The thread_id isn't valid until the threads are created. There is no
point setting it here. The only thing that cares about the thread_id
is qmp_query_cpus_fast.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20240530194250.1801701-4-alex.bennee@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

cpu-target.c

@@ -241,7 +241,6 @@ void cpu_exec_initfn(CPUState *cpu)
     cpu->num_ases = 0;
 
 #ifndef CONFIG_USER_ONLY
-    cpu->thread_id = qemu_get_thread_id();
     cpu->memory = get_system_memory();
     object_ref(OBJECT(cpu->memory));
 #endif