block: rename block/aio.h to qemu/aio.h

AioContexts are used as a generic event loop even outside the block
layer; move the header file out of block/ just like the implementation
is in util/.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

stubs/linux-aio.c

@@ -8,7 +8,7 @@
  * See the COPYING file in the top-level directory.
  */
 #include "qemu/osdep.h"
-#include "block/aio.h"
+#include "qemu/aio.h"
 #include "block/raw-aio.h"
 
 void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context)

stubs/replay-tools.c

@@ -1,6 +1,6 @@
 #include "qemu/osdep.h"
 #include "system/replay.h"
-#include "block/aio.h"
+#include "qemu/aio.h"
 
 bool replay_events_enabled(void)
 {