sysemu: Cleanup qemu_run_machine_init_done_notifiers()

Remove qemu_run_machine_init_done_notifiers() since no implementation
and user.

Fixes: f66dc873 ("vl: move all generic initialization out of vl.c")
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220104024136.1433545-1-xiaoyao.li@intel.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/sysemu/sysemu.h

@@ -16,7 +16,6 @@ extern bool qemu_uuid_set;
 void qemu_add_exit_notifier(Notifier *notify);
 void qemu_remove_exit_notifier(Notifier *notify);
 
-void qemu_run_machine_init_done_notifiers(void);
 void qemu_add_machine_init_done_notifier(Notifier *notify);
 void qemu_remove_machine_init_done_notifier(Notifier *notify);