remove unused function

Reviewed-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/mac_dbdma.c

@@ -661,11 +661,6 @@ void DBDMA_register_channel(void *dbdma, int nchan, qemu_irq irq,
     ch->io.channel = ch;
 }
 
-void DBDMA_schedule(void)
-{
-    qemu_notify_event();
-}
-
 static void
 dbdma_control_write(DBDMA_channel *ch)
 {

hw/mac_dbdma.h

@@ -41,5 +41,4 @@ struct DBDMA_io {
 void DBDMA_register_channel(void *dbdma, int nchan, qemu_irq irq,
                             DBDMA_rw rw, DBDMA_flush flush,
                             void *opaque);
-void DBDMA_schedule(void);
 void* DBDMA_init (MemoryRegion **dbdma_mem);