cpu: Replace qemu_for_each_cpu()

It was introduced to loop over CPUs from target-independent code, but
since commit 182735efaf target-independent
CPUState is used.

A loop can be considered more efficient than function calls in a loop,
and CPU_FOREACH() hides implementation details just as well, so use that
instead.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>

exec.c

@@ -362,15 +362,6 @@ CPUState *qemu_get_cpu(int index)
     return NULL;
 }
 
-void qemu_for_each_cpu(void (*func)(CPUState *cpu, void *data), void *data)
-{
-    CPUState *cpu;
-
-    CPU_FOREACH(cpu) {
-        func(cpu, data);
-    }
-}
-
 void cpu_exec_init(CPUArchState *env)
 {
     CPUState *cpu = ENV_GET_CPU(env);