cpus: Drop declaration of cpu_remove()

cpu_remove() got superseded by cpu_remove_sync() in commit dbadee4ff4,
but its prototype wasn't removed. We could possibly keep the shorter
cpu_remove() naming but it seems better to highligth that this blocks
until the CPU thread is joined.

Fixes: dbadee4ff4 ("cpus: join thread when removing a vCPU")
Cc: pbonzini@redhat.com
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <160268285707.1107461.15035929822602623985.stgit@bahia.lan>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

include/hw/core/cpu.h

@@ -927,14 +927,6 @@ void cpu_exit(CPUState *cpu);
 void cpu_resume(CPUState *cpu);
 
 /**
- * cpu_remove:
- * @cpu: The CPU to remove.
- *
- * Requests the CPU to be removed.
- */
-void cpu_remove(CPUState *cpu);
-
- /**
  * cpu_remove_sync:
  * @cpu: The CPU to remove.
  *